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By Gavin Clarke Reviewed By Andreas Zabczyk Jan 16, 2014 Updated Jan 17, 2019

Dumortierite Quartz Gemstone Information

Dumortierite Quartz Gemstones from GemSelect - Large Image

About Dumortierite Quartz - History and Introduction

Dumortierite quartz is one of the rarer and more unusual blue varieties of quartz gemstones. It is a gemstone-quality combination of quartz aggregate, intergrown with the mineral known as dumortierite. Although quartz can occur in a wide range of colors, blue colored quartz is surprisingly quite rare. The traces of dumortierite are responsible for its distinct color, which can range from light to dark blue and in some cases reddish-brown.

Dumortierite is an aluminum borosilicate with a hardness that can range from 7.0 to 8.5 on the Mohs scale. In aggregate form, mainly when cut, its hardness is 7.0. (the same as quartz), while crystal forms have a hardness rating of 8.5. The mineral was first described in 1881 and was named after French paleontologist, Eugene Dumortier (1803-1873). Dumortierite also has a few industrial purposes other than jewelry. Since it is known to turn remarkably pure white in color when fired, it is often used for the production of porcelain and ceramics.

Blue Dumortierite Quartz Cabochon

Identifying Dumortierite Quartz

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Dumortierite quartz is one of the very few gem-quality varieties of blue colored quartz. Most blue quartz is translucent to opaque, which means transparent materials should be tested for authenticity. Dumortierite is a distinct mineral on its own. By composition, it can be easily identified as an aluminum borosilicate mineral. Dumortierite quartz color can resemble that of a few other popular blue gemstones such as lapis lazuli, azurite and sodalite. However, dumortierite quartz is much harder and more durable than any other similar blue gemstone.

Dumortierite Quartz Origin and Gemstone Sources

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Dumortierite quartz is most often found in Brazil, Canada, France, Italy, Madagascar, Mozambique, Namibia, Norway, Poland, Sri Lanka and the USA.

Buying Dumortierite Quartz and Determining Dumortierite Quartz Gemstone Value Back to Top

Dumortierite Quartz Color

Dumortierite quartz colors can range from red-brown to violet-blue, and from dark to light blue. Dark blue is the most common color. Color is very often unevenly distributed, exhibiting areas of dark and light blue, similar to lapis lazuli and sodalite. Many stones may also exhibit whitish streaks or spots along with their blue color. Dumortierite mineral impurities within the quartz are responsible for the blue color.

Dumortierite Quartz Clarity and Luster

Dumortierite quartz is quartz aggregate intergrown with inclusions of dumortierite. Almost all stones are opaque in clarity, although some very rare and fine materials may appear slightly translucent. Like most quartz aggregates, dumortierite quartz has a waxy to dull luster.

Dumortierite Quartz Cut and Shape

Dumortierite quartz is typically cut en cabochon. It is commonly shaped into traditional ovals and rounds. Large sizes are common, as well as calibrated sizes. Fancy shapes are rare, but not unheard of.

Dumortierite Quartz Treatment

Dumortierite quartz is not known to be treated or artificially enhanced in any way.

Dumortierite Quartz Gemological Properties:

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Chemical Formula: SiO2 Quartz / Al7(BO3)(SiO4)3O Dumortierite
Crystal Structure: Quartz: Trigonal / dumortierite: orthorhombic
Color: Light blue, blue, dark blue, violet-blue, white-blue, red-brown
Hardness: 7 to 8.5 on the Mohs scale (Varies)
Refractive Index: Quartz: 1.544 to 1.553 / dumortierite: 1.678 to 1.689
Density: Quartz: 2.65 / dumortierite: 3.26 to 3.41
Cleavage: Quartz: None / dumortierite: Good
Transparency: Translucent to opaque
Double Refraction or Birefringence: Quartz: 0.009 / dumortierite: -0.015 to -0.037
Luster: Waxy to dull
Fluorescence: Quartz: Typically none / dumortierite: Weak - blue, blue-violet, violet

Please refer to our Gemstone Glossary for details of gemology-related terms.

Dumortierite Quartz: Varieties or Similar Gemstones:

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Rutile Quartz
Rutile Quartz

Dumortierite quartz is one of the many varieties of quartz gemstones available today. Approximately 12% of the Earth's crust is composed of quartz, making it the second most abundant mineral on earth. There are a handful of gems which are similar to dumortierite quartz in regard to color, including lapis lazuli, sodalite, azurite, blue magnesioriebeckite and crocidolite-included fibrous quartz.

Dumortierite quartz is sometimes sold under marketing trade names such as 'blue moon quartz' or 'blue denim stone', but these are not officially recognized trade names.

Most Popular Related Gemstones:

Rutile quartz, aventurine quartz, rock quartz, smoky quartz, rose quartz, bloodstone, cat's eye quartz, agate, chalcedony, carnelian, amethyst, citrine and ametrine are some of the most common and popularly used trade names for similar or related gemstones.

Lesser-Known Related Gemstones:

Hawk's eye, prasiolite, heliotrope, chrysocolla chalcedony (gem silica), sardonyx, sard, prase, onyx, mystic quartz, strawberry quartz and blue quartz are the some of the rarer and lesser-known trade names for similar or related gemstones.

Dumortierite Quartz Gemstone Mythology, Metaphysical and Alternative Healing

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Dumortierite quartz is a special variety of blue quartz that is thought to enhance organizational abilities and self-discipline. It is considered a stone of peace, order and expression. Dumortierite quartz is thought to be best at balancing the energies associated with the throat chakra, but it can also help stimulate communication between the higher and lower chakras.

Dumortierite quartz is also thought to be very stimulating for the brain. Many believe that it can enhance intellectual abilities by strengthening mathematical and language development. It is said to help expel fear, boost courage and aid the release of both stubborn wilfulness and personal addictions. Dumortierite quartz can help to increase patience and help you to take control of your life.

Disclaimer: Metaphysical and Alternative Crystal Healing Powers and Properties are not to be taken as confirmed advice. Traditional, Ceremonial and Mythological Gemstone Lore is collected from various resources and does not represent the sole opinion of SETT Co., Ltd. This information is not to replace the advice of your doctor. Should you have any medical conditions, please see a licensed medical practitioner. GemSelect does not guarantee any claims or statements of healing or astrological birthstone powers and cannot be held liable under any circumstances.

Dumortierite Quartz Gemstone and Jewelry Design Ideas

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Dumortierite quartz is ideal for any type of jewelry design imaginable, particularly due to the fact that it has excellent hardness and durability. It can be worn as attractive pins, pendants, bracelets, necklaces and everyday gemstone rings. Dumortierite quartz stones are also typically available in very large sizes and can be acquired for very reasonable prices, making it a favorite for many jewelery designers.

The unusually attractive blue color of dumortierite quartz is appealing to both men and women and can often make an excellent alternative to the softer lapis lazuli or sodalite. Dumortierite quartz is often cut into beads and cabochons, making it ideal for beaded or stranded jewelry. It is also popular for ornamental carvings including small animal cameos and figurines. Since dumortierite quartz is one of the rarer varieties of quartz, it's probably not something you'll find to be readily available in local jewelry stores, which means that you may need to order it from specialized dealers.

Note: Buy colored gemstones by size and not by carat weight. Colored stones vary in size-to-weight ratio. Some stones are larger and others are smaller than diamonds by weight in comparison.

Dumortierite Quartz Gemstone and Jewelry Care and CleaningBack to Top

How to clean your gemstonesDumortierite quartz does not require much when it comes to care and maintenance. It is considered to be quite hard and very durable. However, other harder substances, such as topaz, diamond or sapphire can easily scratch quartz, so care is required when wearing or mixing different types of gemstones. Dumortierite quartz can easily be cleaned using warm soapy water and a soft cloth or brush. Be sure to rinse well to remove any soapy residue.

As with most gemstones, avoid the use of harsh household chemicals as they can permanently damage the attractive color of your stones. Avoid prolonged exposure to extreme heat since heat can also alter the color of your gemstones. Although dumortierite quartz is quite durable, jewelry should still be removed prior to playing sports, exercising or performing any intense household chores. When storing dumortierite quartz, store it separately from other gemstones. It is suggested that you wrap it in a soft cloth or place it inside a fabric-lined box for added protection.

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