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Quartz with Anatase

It is common to find inclusions in quartz crystals. Quartz is usually one of the last minerals to form in a deposit, so it sometimes grows around existing crystals. Because quartz is commonly clear, the inclusions are easy to see. This emerald–cut quartz from Brazil has a blue anatase crystal inclusion as well as needle-like inclusions of rutile. In this specimen, we can see the anatase inclusion seemingly floating in this clear quartz gem. Anatase is a form of titanium dioxide and is usually found as small, isolated, well-developed crystals. This is the first quartz gemstone with an anatase inclusion in the National Gem Collection.

Image Number: Ken Larsen
Catalog Number: G10628
Weight: 3.20 carats
Gift of Luciana Barbosa, Gemological Center , 2009
Locality: Diamantina, Minas Gerais , Brazil

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Smithsonian National Museum of Natural History Department of Mineral Sciences website Credits