Specific Gravity Chart
Specific gravity is a way to express the relative density of a gemstone. It is measured as the ratio of the density of the gemstone to the density of water. It is expressed as a number that indicates how much heavier the gemstone is compared to an equal volume of water.
Scientifically, specific gravity is defined as a ratio of the mass of a given material to the mass of an equal volume of water at 4 degrees centigrade. Most gemstone substances are two to four times denser than an equal volume of water. Specific gravities are expressed in decimal numbers, for example, 4.00 for corundum, 3.52 for diamond , and 2.72 for quartz. Zircon, one of the densest of all gemstones, may have a specific gravity as high as 4.73!
Specific gravity is an important tool in gemstone identification that is useful for the gem buyer as well as the gemologist. A 1-carat stone with higher specific gravity will be smaller than a 1-carat stone with lower specific gravity. So don't be surprised when the sapphire you buy is smaller than your diamond. That's because sapphire has a higher specific gravity. On the other hand, the 5-carat tourmaline you buy might be larger than you expected, because tourmaline has a fairly low specific gravity.
The following chart lists the specific gravity of 145 varieties of gemstones, arranged in descending order.
|
Cassiterite |
||
|
Specific Gravity |
6.7 - 7.1 |
|
Chemical Composition |
Tin oxide |
|
|
Crystal Structure |
Tetragonal |
|
|
Hematite |
||
|
Specific Gravity |
5.12 - 5.28 |
|
Chemical Composition |
Iron oxide |
|
|
Crystal Structure |
Trigonal |
|
|
Rainbow Pyrite |
||
|
Specific Gravity |
5 - 5.2 |
|
Chemical Composition |
Iron sulphide |
|
|
Crystal Structure |
Cubic |
|
|
Spessartite Garnet |
||
|
Specific Gravity |
4.12 - 4.18 |
|
Chemical Composition |
Manganese aluminium silicate |
|
|
Crystal Structure |
Cubic |
|
|
Smithsonite |
||
|
Specific Gravity |
4 - 4.65 |
|
Chemical Composition |
Zinc carbonate |
|
|
Crystal Structure |
Trigonal |
|
|
Star Ruby |
||
|
Specific Gravity |
3.97 - 4.05 |
|
Chemical Composition |
Aluminum oxide |
|
|
Crystal Structure |
Trigonal |
|
|
Ruby |
||
|
Specific Gravity |
3.97 - 4.05 |
|
Chemical Composition |
Aluminum oxide |
|
|
Crystal Structure |
Trigonal |
|
|
Color Change Sapphire |
||
|
Specific Gravity |
3.95 - 4.03 |
|
Chemical Composition |
Aluminum oxide |
|
|
Crystal Structure |
Trigonal |
|
|
Sapphire |
||
|
Specific Gravity |
3.95 - 4.03 |
|
Chemical Composition |
Aluminum oxide |
|
|
Crystal Structure |
Trigonal |
|
|
Star Sapphire |
||
|
Specific Gravity |
3.95 - 4.03 |
|
Chemical Composition |
Aluminium oxide |
|
|
Crystal Structure |
Trigonal |
|
|
Almandine Garnet |
||
|
Specific Gravity |
3.93 - 4.3 |
|
Chemical Composition |
Iron aluminium silicate |
|
|
Crystal Structure |
Cubic |
|
|
Zircon |
||
|
Specific Gravity |
3.93 - 4.73 |
|
Chemical Composition |
Zirconium silicate |
|
|
Crystal Structure |
Tetragonal |
|
|
Sphalerite |
||
|
Specific Gravity |
3.9 - 4.1 |
|
Chemical Composition |
Zinc sulphide |
|
|
Crystal Structure |
Cubic |
|
|
Rhodolite Garnet |
||
|
Specific Gravity |
3.85 |
|
Chemical Composition |
Magnesium aluminum silicate |
|
|
Crystal Structure |
Cubic |
|
|
Gaspeite |
||
|
Specific Gravity |
3.71 |
|
Chemical Composition |
Nickel magnesium iron carbonate |
|
|
Crystal Structure |
Trigonal |
|
|
Melanite |
||
|
Specific Gravity |
3.7 - 4.1 |
|
Chemical Composition |
Calcium iron silicate |
|
|
Crystal Structure |
Cubic |
|
|
Chrysoberyl Cat's Eye |
||
|
Specific Gravity |
3.7 - 3.78 |
|
Chemical Composition |
Beryllium aluminium oxide |
|
|
Crystal Structure |
Orthorhombic |
|
|
Alexandrite |
||
|
Specific Gravity |
3.7 - 3.78 |
|
Chemical Composition |
Beryllium aluminum oxide |
|
|
Crystal Structure |
Orthorhombic |
|
|
Azurite |
||
|
Specific Gravity |
3.7 - 3.9 |
|
Chemical Composition |
Basic Copper Carbonate |
|
|
Crystal Structure |
Monoclinic |
|
|
Demantoid Garnet |
||
|
Specific Gravity |
3.7 - 4.1 |
|
Chemical Composition |
Calcium iron silicate |
|
|
Crystal Structure |
Cubic |
|
|
Chrysoberyl |
||
|
Specific Gravity |
3.7 - 3.78 |
|
Chemical Composition |
Beryllium aluminium oxide |
|
|
Crystal Structure |
Orthorhombic |
|
|
Hessonite Garnet |
||
|
Specific Gravity |
3.64 - 3.69 |
|
Chemical Composition |
Calcium aluminum silicate |
|
|
Crystal Structure |
Cubic |
|
|
Color-Change Garnet |
||
|
Specific Gravity |
3.62 - 3.87 |
|
Chemical Composition |
Magnesium aluminum silicate |
|
|
Crystal Structure |
Cubic |
|
|
Pyrope Garnet |
||
|
Specific Gravity |
3.62 - 3.87 |
|
Chemical Composition |
Magnesiium aluminum silicate |
|
|
Crystal Structure |
Cubic |
|
|
Star Garnet |
||
|
Specific Gravity |
3.62 - 3.87 |
|
Chemical Composition |
Iron aluminum silicate |
|
|
Crystal Structure |
Rhombic |
|
|
Grossularite Garnet |
||
|
Specific Gravity |
3.57 - 3.73 |
|
Chemical Composition |
Calcium aluminum silicate |
|
|
Crystal Structure |
Cubic |
|
|
Mali Garnet |
||
|
Specific Gravity |
3.57 - 3.73 |
|
Chemical Composition |
Calcium aluminum silicate |
|
|
Crystal Structure |
Cubic |
|
|
Tsavorite Garnet |
||
|
Specific Gravity |
3.57 - 3.73 |
|
Chemical Composition |
Calcium aluminum silicate |
|
|
Crystal Structure |
Rhombic |
|
|
Spinel |
||
|
Specific Gravity |
3.54 - 3.63 |
|
Chemical Composition |
Magnesium aluminium oxide |
|
|
Crystal Structure |
Cubic |
|
|
Kyanite |
||
|
Specific Gravity |
3.53 - 3.7 |
|
Chemical Composition |
Aluminum silicate |
|
|
Crystal Structure |
Triclinic |
|
|
Sphene |
||
|
Specific Gravity |
3.52 - 3.54 |
|
Chemical Composition |
Calcium titanium silicate |
|
|
Crystal Structure |
Monoclinic |
|
|
Diamond |
||
|
Specific Gravity |
3.5 - 3.53 |
|
Chemical Composition |
Carbon |
|
|
Crystal Structure |
Cubic |
|
|
Topaz |
||
|
Specific Gravity |
3.49 - 3.57 |
|
Chemical Composition |
Aluminum fluosilicate |
|
|
Crystal Structure |
Orthorhombic |
|
|
Mystic Topaz |
||
|
Specific Gravity |
3.49 - 3.57 |
|
Chemical Composition |
Aluminum fluosilicate |
|
|
Crystal Structure |
Orthorhombic |
|
|
Imperial Topaz |
||
|
Specific Gravity |
3.49 - 3.57 |
|
Chemical Composition |
Aluminum fluosilicate |
|
|
Crystal Structure |
Orthorhombic |
|
|
Azotic Topaz |
||
|
Specific Gravity |
3.49 - 3.57 |
|
Chemical Composition |
Aluminum fluosilicate |
|
|
Crystal Structure |
Orthorhombic |
|
|
Rutile Topaz |
||
|
Specific Gravity |
3.49 - 3.57 |
|
Chemical Composition |
Aluminum fluorsilicate |
|
|
Crystal Structure |
Orthorhombic |
|
|
Rhodochrosite |
||
|
Specific Gravity |
3.45 - 3.7 |
|
Chemical Composition |
Manganese carbonate |
|
|
Crystal Structure |
Trigonal |
|
|
Rhodonite |
||
|
Specific Gravity |
3.4 - 3.74 |
|
Chemical Composition |
Manganese silicate |
|
|
Crystal Structure |
Triclinic |
|
|
Ruby in Zoisite |
||
|
Specific Gravity |
3.35 |
|
Chemical Composition |
Rock containing zoisite, ruby and hornblende |
|
|
Crystal Structure |
Orthorhombic |
|
|
Tanzanite |
||
|
Specific Gravity |
3.35 |
|
Chemical Composition |
Calcium aluminium silicate |
|
|
Crystal Structure |
Orthorhombic |
|
|
Idocrase |
||
|
Specific Gravity |
3.32 - 3.47 |
|
Chemical Composition |
Complex calcium aluminum silicate |
|
|
Crystal Structure |
Tetragonal |
|
|
Cat's Eye Diaspore |
||
|
Specific Gravity |
3.3 - 3.39 |
|
Chemical Composition |
Hydrated aluminum oxide |
|
|
Crystal Structure |
Orthorhombic |
|
|
Hemimorphite |
||
|
Specific Gravity |
3.3 - 3.5 |
|
Chemical Composition |
Hydrous basic zinc silicate |
|
|
Crystal Structure |
Orthorhombic |
|
|
Color Change Diaspore |
||
|
Specific Gravity |
3.3 - 3.39 |
|
Chemical Composition |
Hydrated aluminum oxide |
|
|
Crystal Structure |
Orthorhombic |
|
|
Peridot |
||
|
Specific Gravity |
3.28 - 3.48 |
|
Chemical Composition |
Magnesium iron silicate |
|
|
Crystal Structure |
Orthorhombic |
|
|
Axinite |
||
|
Specific Gravity |
3.26 - 3.36 |
|
Chemical Composition |
Calcium aluminum borate silicate |
|
|
Crystal Structure |
Triclinic |
|
|
Dumortierite Quartz |
||
|
Specific Gravity |
3.26 - 3.41 |
|
Chemical Composition |
Aluminum borate silicate intergrown with quartz |
|
|
Crystal Structure |
Orthorhombic |
|
|
Malachite |
||
|
Specific Gravity |
3.25 - 4.1 |
|
Chemical Composition |
Basic copper carbonate |
|
|
Crystal Structure |
Monoclinic |
|
|
Sillimanite Cat's Eye |
||
|
Specific Gravity |
3.23 |
|
Chemical Composition |
Aluminum silicate |
|
|
Crystal Structure |
Orthorhombic |
|
|
Chrome Diopside |
||
|
Specific Gravity |
3.22 - 3.38 |
|
Chemical Composition |
Calcium magnesium silicate |
|
|
Crystal Structure |
Monoclinic |
|
|
Tashmarine Diopside |
||
|
Specific Gravity |
3.22 - 3.38 |
|
Chemical Composition |
Calcium magnesium silicate |
|
|
Crystal Structure |
Monoclinic |
|
|
Star Diopside |
||
|
Specific Gravity |
3.22 - 3.38 |
|
Chemical Composition |
Calcium manganese silicate |
|
|
Crystal Structure |
Monoclinic |
|
|
Hiddenite |
||
|
Specific Gravity |
3.17 - 3.19 |
|
Chemical Composition |
Lithium aluminum silicate |
|
|
Crystal Structure |
Monoclinic |
|
|
Apatite |
||
|
Specific Gravity |
3.16 - 3.23 |
|
Chemical Composition |
Basic fluoro- and chloro-calicum phosphate |
|
|
Crystal Structure |
Hexagonal |
|
|
Cat's Eye Apatite |
||
|
Specific Gravity |
3.16 - 3.23 |
|
Chemical Composition |
Basic fluoro- and chloro-calicum phosphate |
|
|
Crystal Structure |
Hexagonal |
|
|
Spodumene |
||
|
Specific Gravity |
3.15 - 3.21 |
|
Chemical Composition |
Lithium aluminum silicate |
|
|
Crystal Structure |
Monoclinic |
|
|
Kunzite |
||
|
Specific Gravity |
3.15 - 3.21 |
|
Chemical Composition |
Lithium aluminum silicate |
|
|
Crystal Structure |
Monoclinic |
|
|
Clinohumite |
||
|
Specific Gravity |
3.13 - 3.75 |
|
Chemical Composition |
Magnesium silicate |
|
|
Crystal Structure |
Monoclinic |
|
|
Andalusite |
||
|
Specific Gravity |
3.05 - 3.2 |
|
Chemical Composition |
Aluminium silicate |
|
|
Crystal Structure |
Orthorhombic |
|
|
Fluorite |
||
|
Specific Gravity |
3 - 3.25 |
|
Chemical Composition |
Calcium fluoride |
|
|
Crystal Structure |
Cubic |
|
|
Nuummite |
||
|
Specific Gravity |
3 |
|
Chemical Composition |
Rock containing gedrite and anthophyllite |
|
|
Crystal Structure |
Lamellar fibrous structure |
|
|
Danburite |
||
|
Specific Gravity |
2.97 - 3.03 |
|
Chemical Composition |
Calcium boric silicate |
|
|
Crystal Structure |
Orthorhombic |
|
|
Jadeite |
||
|
Specific Gravity |
2.9 - 3.03 |
|
Chemical Composition |
Basic calcium magnesium iron silicate |
|
|
Crystal Structure |
Monoclinic |
|
|
Nephrite Jade |
||
|
Specific Gravity |
2.9 - 3.03 |
|
Chemical Composition |
Calcium magnesium iron silicate |
|
|
Crystal Structure |
Monoclinic |
|
|
Tourmaline |
||
|
Specific Gravity |
2.83 - 3.32 |
|
Chemical Composition |
Silicate compounded with aluminium, iron, magnesium, sodium, lithium or potassium |
|
|
Crystal Structure |
Trigonal |
|
|
Chrome Tourmaline |
||
|
Specific Gravity |
2.82 - 3.32 |
|
Chemical Composition |
Silicate compounded with aluminium, iron, magnesium, sodium, lithium or potassium |
|
|
Crystal Structure |
Trigonal |
|
|
Prehnite |
||
|
Specific Gravity |
2.82 - 2.94 |
|
Chemical Composition |
Basic calcium aluminum silicate |
|
|
Crystal Structure |
Orthorhombic |
|
|
Paraiba Tourmaline |
||
|
Specific Gravity |
2.82 - 3.32 |
|
Chemical Composition |
Silicate compounded with aluminium, iron, magnesium, sodium, lithium or potassium |
|
|
Crystal Structure |
Trigonal |
|
|
Cat's Eye Tourmaline |
||
|
Specific Gravity |
2.82 - 3.32 |
|
Chemical Composition |
Silicate compounded with aluminium, iron, magnesium, sodium, lithium or potassium |
|
|
Crystal Structure |
Trigonal |
|
|
Lepidolite |
||
|
Specific Gravity |
2.8 - 2.9 |
|
Chemical Composition |
Potassium lithium aluminum fluoro-silicate |
|
|
Crystal Structure |
Monoclinic |
|
|
Verdite |
||
|
Specific Gravity |
2.76 - 3 |
|
Chemical Composition |
Serpentine rock |
|
|
Crystal Structure |
Monoclinic |
|
|
Sugilite |
||
|
Specific Gravity |
2.76 - 2.8 |
|
Chemical Composition |
Potassium sodium lithium iron manganese aluminium |
|
|
Crystal Structure |
Hexagonal |
|
|
Ammolite |
||
|
Specific Gravity |
2.75 - 2.8 |
|
Chemical Composition |
Mainly aragonite (with calcite, silica and pyrite) |
|
|
Crystal Structure |
Amorphous |
|
|
Larimar |
||
|
Specific Gravity |
2.74 - 2.88 |
|
Chemical Composition |
Hydrated sodium calcium silicate with manganese |
|
|
Crystal Structure |
Triclinic |
|
|
Calcite |
||
|
Specific Gravity |
2.69 - 2.71 |
|
Chemical Composition |
Calcium carbonate |
|
|
Crystal Structure |
Trigonal |
|
|
Aquamarine |
||
|
Specific Gravity |
2.68 - 2.74 |
|
Chemical Composition |
Aluminium beryllium silicate |
|
|
Crystal Structure |
Hexagonal |
|
|
Cat's Eye Aquamarine |
||
|
Specific Gravity |
2.68 - 2.74 |
|
Chemical Composition |
Aluminum beryllium silicate |
|
|
Crystal Structure |
Hexagonal |
|
|
Beryl |
||
|
Specific Gravity |
2.67 - 2.78 |
|
Chemical Composition |
Aluminium beryllium silicate |
|
|
Crystal Structure |
Hexagonal |
|
|
Emerald |
||
|
Specific Gravity |
2.67 - 2.78 |
|
Chemical Composition |
Aluminium beryllium silicate |
|
|
Crystal Structure |
Hexagonal |
|
|
Goshenite |
||
|
Specific Gravity |
2.66 - 2.87 |
|
Chemical Composition |
Aluminum beryllium silicate |
|
|
Crystal Structure |
Hexagonal |
|
|
Andesine Labradorite |
||
|
Specific Gravity |
2.66 - 2.68 |
|
Chemical Composition |
Sodium calcium aluminum silicate |
|
|
Crystal Structure |
Triclinic |
|
|
Morganite |
||
|
Specific Gravity |
2.66 - 2.87 |
|
Chemical Composition |
Aluminium beryllium silicate |
|
|
Crystal Structure |
Hexagonal |
|
|
Amethyst |
||
|
Specific Gravity |
2.65 |
|
Chemical Composition |
Silicon dioxide |
|
|
Crystal Structure |
Trigonal |
|
|
Rose Quartz |
||
|
Specific Gravity |
2.65 |
|
Chemical Composition |
Silicon dioxide |
|
|
Crystal Structure |
Trigonal |
|
|
Ametrine |
||
|
Specific Gravity |
2.65 |
|
Chemical Composition |
Silicon dioxide |
|
|
Crystal Structure |
Trigonal |
|
|
Citrine |
||
|
Specific Gravity |
2.65 |
|
Chemical Composition |
Silicon dioxide |
|
|
Crystal Structure |
Hexagonal |
|
|
Quartz Cat's Eye |
||
|
Specific Gravity |
2.65 |
|
Chemical Composition |
Silicon dioxide |
|
|
Crystal Structure |
Trigonal |
|
|
Rutile Quartz |
||
|
Specific Gravity |
2.65 |
|
Chemical Composition |
Silicon dioxide with titanium inclusions |
|
|
Crystal Structure |
Trigonal |
|
|
Onyx |
||
|
Specific Gravity |
2.65 - 2.91 |
|
Chemical Composition |
Silicon dioxide |
|
|
Crystal Structure |
Trigonal |
|
|
Smoky Quartz |
||
|
Specific Gravity |
2.65 |
|
Chemical Composition |
Silicon dioxide |
|
|
Crystal Structure |
Trigonal |
|
|
Strawberry Quartz |
||
|
Specific Gravity |
2.65 |
|
Chemical Composition |
Silicon dioxide with iron oxide inclusions |
|
|
Crystal Structure |
Trigonal |
|
|
Mystic Quartz |
||
|
Specific Gravity |
2.65 |
|
Chemical Composition |
Silicon dioxide |
|
|
Crystal Structure |
Trigonal |
|
|
Quartz |
||
|
Specific Gravity |
2.65 |
|
Chemical Composition |
Silicon dioxide |
|
|
Crystal Structure |
Trigonal |
|
|
Labradorite |
||
|
Specific Gravity |
2.65 - 2.75 |
|
Chemical Composition |
Sodium calcium aluminum silicate |
|
|
Crystal Structure |
Triclinic |
|
|
Aventurine |
||
|
Specific Gravity |
2.64 - 2.69 |
|
Chemical Composition |
Silicon dioxide |
|
|
Crystal Structure |
Trigonal |
|
|
Star Sunstone |
||
|
Specific Gravity |
2.62 - 2.65 |
|
Chemical Composition |
Sodium calcium aluminum silicate |
|
|
Crystal Structure |
Triclinic |
|
|
Sunstone |
||
|
Specific Gravity |
2.62 - 2.65 |
|
Chemical Composition |
Sodium calcium aluminium silicate |
|
|
Crystal Structure |
Triclinic |
|
|
Pietersite |
||
|
Specific Gravity |
2.6 |
|
Chemical Composition |
Silicon dioxide |
|
|
Crystal Structure |
Aggregate |
|
|
Agate |
||
|
Specific Gravity |
2.6 - 2.64 |
|
Chemical Composition |
Silicon dioxide |
|
|
Crystal Structure |
Trigonal |
|
|
Fossil Coral |
||
|
Specific Gravity |
2.6 - 2.7 |
|
Chemical Composition |
Silicon dioxide |
|
|
Crystal Structure |
Trigonal |
|
|
Pearl |
||
|
Specific Gravity |
2.6 - 2.85 |
|
Chemical Composition |
Calcium carbonate |
|
|
Crystal Structure |
Orthorhombic |
|
|
Coral |
||
|
Specific Gravity |
2.6 - 2.7 |
|
Chemical Composition |
Calcium carbonate |
|
|
Crystal Structure |
Trigonal |
|
|
Agate Geode |
||
|
Specific Gravity |
2.6 - 2.64 |
|
Chemical Composition |
Silicon dioxide |
|
|
Crystal Structure |
Trigonal |
|
|
Chrysoprase |
||
|
Specific Gravity |
2.58 - 2.64 |
|
Chemical Composition |
Silicon dioxide |
|
|
Crystal Structure |
Trigonal |
|
|
Iolite |
||
|
Specific Gravity |
2.58 - 2.66 |
|
Chemical Composition |
Magnesium aluminum silicate |
|
|
Crystal Structure |
Orthorhombic |
|
|
Tiger's Eye Matrix |
||
|
Specific Gravity |
2.58 - 2.64 |
|
Chemical Composition |
Rock containing layers of quartz and iron oxide |
|
|
Crystal Structure |
Trigonal |
|
|
Dendritic Agate |
||
|
Specific Gravity |
2.58 - 2.64 |
|
Chemical Composition |
Silicon dioxide |
|
|
Crystal Structure |
Trigonal |
|
|
Fire Agate |
||
|
Specific Gravity |
2.58 - 2.64 |
|
Chemical Composition |
Silicon dioxide |
|
|
Crystal Structure |
Trigonal |
|
|
Chalcedony |
||
|
Specific Gravity |
2.58 - 2.64 |
|
Chemical Composition |
Silicon dioxide |
|
|
Crystal Structure |
Trigonal |
|
|
Star Rose Quartz |
||
|
Specific Gravity |
2.58 - 2.64 |
|
Chemical Composition |
Silicon dioxide |
|
|
Crystal Structure |
Hexagonal |
|
|
Peanut Wood |
||
|
Specific Gravity |
2.58 - 2.91 |
|
Chemical Composition |
Silicon dioxide |
|
|
Crystal Structure |
Trigonal |
|
|
Carnelian |
||
|
Specific Gravity |
2.58 - 2.64 |
|
Chemical Composition |
Silicon dioxide |
|
|
Crystal Structure |
Trigonal |
|
|
Bloodstone |
||
|
Specific Gravity |
2.58 - 2.64 |
|
Chemical Composition |
Silicon dioxide |
|
|
Crystal Structure |
Trigonal |
|
|
Tiger's Eye |
||
|
Specific Gravity |
2.58 - 2.64 |
|
Chemical Composition |
Silicon dioxide |
|
|
Crystal Structure |
Trigonal |
|
|
Scapolite |
||
|
Specific Gravity |
2.57 - 2.74 |
|
Chemical Composition |
Sodium calcium aluminium silicate |
|
|
Crystal Structure |
Tetragonal |
|
|
Cat's Eye Scapolite |
||
|
Specific Gravity |
2.57 - 2.74 |
|
Chemical Composition |
Sodium calcium aluminum silicate |
|
|
Crystal Structure |
Tetragonal |
|
|
Amazonite |
||
|
Specific Gravity |
2.56 - 2.58 |
|
Chemical Composition |
Potassium aluminum silicate |
|
|
Crystal Structure |
Triclinic |
|
|
Orthoclase |
||
|
Specific Gravity |
2.56 - 2.58 |
|
Chemical Composition |
Potassium aluminum silicate |
|
|
Crystal Structure |
Monoclinic |
|
|
Rainbow Moonstone |
||
|
Specific Gravity |
2.56 - 2.59 |
|
Chemical Composition |
Potassium aluminum silicate |
|
|
Crystal Structure |
Monoclinic |
|
|
Star Moonstone |
||
|
Specific Gravity |
2.56 - 2.59 |
|
Chemical Composition |
Potassium aluminum silicate |
|
|
Crystal Structure |
Monoclinic |
|
|
Moonstone |
||
|
Specific Gravity |
2.56 - 2.59 |
|
Chemical Composition |
Potassium aluminum silicate |
|
|
Crystal Structure |
Monoclinic |
|
|
Seraphinite |
||
|
Specific Gravity |
2.55 - 2.75 |
|
Chemical Composition |
Magnesium iron aluminum silicate hyroxide |
|
|
Crystal Structure |
Monoclinic |
|
|
Charoite |
||
|
Specific Gravity |
2.54 - 2.78 |
|
Chemical Composition |
Complex silicate containing phosphorus, calcium and sodium |
|
|
Crystal Structure |
Monoclinic |
|
|
Lapis Lazuli |
||
|
Specific Gravity |
2.5 - 3 |
|
Chemical Composition |
Sodium calcium aluminum silicate |
|
|
Crystal Structure |
Cubic |
|
|
Maw-Sit-Sit |
||
|
Specific Gravity |
2.5 - 3.5 |
|
Chemical Composition |
Rock containing variable amounts of kosmochlor, jadeite and albite |
|
|
Crystal Structure |
Monoclinic, prismatic |
|
|
Jasper |
||
|
Specific Gravity |
2.5 - 2.9 |
|
Chemical Composition |
Silicon dioxide |
|
|
Crystal Structure |
Trigonal |
|
|
Howlite |
||
|
Specific Gravity |
2.45 - 2.58 |
|
Chemical Composition |
Calcium borosilicate hydroxide |
|
|
Crystal Structure |
Monoclinic |
|
|
Serpentine |
||
|
Specific Gravity |
2.44 - 2.62 |
|
Chemical Composition |
Basic magnesium silicate |
|
|
Crystal Structure |
Microcrystalline |
|
|
Variscite |
||
|
Specific Gravity |
2.42 - 2.58 |
|
Chemical Composition |
Hydrous aluminum phosphate |
|
|
Crystal Structure |
Orthorhombic |
|
|
Hambergite |
||
|
Specific Gravity |
2.35 |
|
Chemical Composition |
Beryllium borate |
|
|
Crystal Structure |
Orthorhombic |
|
|
Obsidian |
||
|
Specific Gravity |
2.35 - 2.6 |
|
Chemical Composition |
Siliceous glassy rock |
|
|
Crystal Structure |
Amorphous |
|
|
Snowflake Obsidian |
||
|
Specific Gravity |
2.35 - 2.6 |
|
Chemical Composition |
Siliceous glassy rock |
|
|
Crystal Structure |
Amorphous |
|
|
Moldavite |
||
|
Specific Gravity |
2.32 - 2.38 |
|
Chemical Composition |
Silicon dioxide + aluminum oxide |
|
|
Crystal Structure |
Amorphous |
|
|
Turquoise |
||
|
Specific Gravity |
2.31 - 2.84 |
|
Chemical Composition |
Hydrated copper aluminum phosphate |
|
|
Crystal Structure |
Triclinic |
|
|
Rubellite Tourmaline |
||
|
Specific Gravity |
2.28 - 3.32 |
|
Chemical Composition |
Silicate compounded with aluminium, iron, magnesium, sodium, lithium or potassium |
|
|
Crystal Structure |
Trigonal |
|
|
Sodalite |
||
|
Specific Gravity |
2.27 - 2.33 |
|
Chemical Composition |
Sodium aluminum silicate chloride |
|
|
Crystal Structure |
Cubic |
|
|
Hackmanite |
||
|
Specific Gravity |
2.14 - 2.4 |
|
Chemical Composition |
Sodium aluminum silicate chloride |
|
|
Crystal Structure |
Cubic |
|
|
Opal Doublet |
||
|
Specific Gravity |
1.98 - 2.5 |
|
Chemical Composition |
Hydrous silicon dioxide |
|
|
Crystal Structure |
Amorphous |
|
|
Fire Opal |
||
|
Specific Gravity |
1.98 - 2.5 |
|
Chemical Composition |
Hydrous silicon dioxide |
|
|
Crystal Structure |
Amorphous |
|
|
Moss Opal |
||
|
Specific Gravity |
1.98 - 2.5 |
|
Chemical Composition |
Hydrous silicon dioxide |
|
|
Crystal Structure |
Amorphous |
|
|
Opal |
||
|
Specific Gravity |
1.98 - 2.5 |
|
Chemical Composition |
Hydrous silicon dioxide |
|
|
Crystal Structure |
Amorphous |
|
|
Boulder Opal |
||
|
Specific Gravity |
1.98 - 2.5 |
|
Chemical Composition |
Hydrous silicon dioxide |
|
|
Crystal Structure |
Amorphous |
|
|
Chrysocolla |
||
|
Specific Gravity |
1.9 - 2.4 |
|
Chemical Composition |
Hydrous copper silicate |
|
|
Crystal Structure |
Monoclinic |
|
|
Amber |
||
|
Specific Gravity |
1.05 - 1.1 |
|
Chemical Composition |
Oxygenated hydrocarbon (variable) |
|
|
Crystal Structure |
Amorphous |
|
- 首次发布于: January-08-2008
- 最后更新于：: November-19-2019
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未经GemSelect.com（SETT Company Ltd.）的书面同意，严格禁止复制（文字或图形)。.
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