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By Gavin Clarke
Reviewed By Andreas Zabczyk
The World of Quartz Gemstones![]() Natural Lemon Quartz Gemstone
Quartz gemstones are among the most versatile and widely recognized stones in the world, prized for their beauty, durability, and array of colors. From the clear, transparent brilliance of quartz crystal to the vibrant hues of amethyst and citrine, these gemstones have captured the fascination of collectors, jewelers, and spiritual enthusiasts alike. We have a diverse selection of quartz gemstones for sale. ![]() Natural Amethyst from GemSelect
All quartz is silicon dioxide, but this was not discovered until the early nineteenth century. Prior to that, many different forms of quartz were thought to be distinct minerals. This is not really surprising, since there are two very different branches of the quartz family. When most people think of quartz stone, they think of what is known as macrocrystalline quartz, which includes rock crystal, amethyst, citrine, smoky quartz, rose quartz and tiger's eye. Macrocrystalline quartz, as the name suggests, has large crystals that can be distinguished by the naked eye. This type of quartz gemstone is mainly transparent to translucent, with a vitreous luster. ![]() Chalcedony from GemSelect
The other type of quartz is known as cryptocrystalline quartz. It has microscopically (or submicroscopically) small crystals and is usually translucent to opaque, with a waxy to greasy or dull luster. This kind of quartz gem has fibrous and granular subcategories. The fibrous varieties are known as chalcedony, but this name covers a remarkable variety of stones. ![]() Natural Onyx
In practice, the name chalcedony refers to solid colored cryptocrystalline quartz, especially of a light color. The patterned varieties tend to have their own names. The most famous of these include agate, distinguished by its bands of color; onyx, which is black and white layered chalcedony (and is usually dyed to produce a uniform black); carnelian, a yellow-orange to reddish-orange type of chalcedony, colored by iron; and chrysoprase, an apple-green variety that is colored by nickle. ![]() Jasper Gemstone
The granular varieties include jasper and bloodstone. Jasper is typically multicolored, spotted or flamed. Especially treasured pieces form patterns that look like natural landscapes. Bloodstone, also known as heliotrope, is dark-green with flecks of red, caused by iron oxide.
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