Citrine Quartz
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Quartz is silicon dioxide, SiO2. Quartz is abundant in the Earth's crust, being the chemically simplest form of the silicates. All the samples here are displayed in the Smithsonian Museum of Natural History. Citrine quartz is one of the noted varieties of quartz, and is often of gem quality. The gems at right are 264.7 and 636.6 carats and are from Minas Gerais, Brazil. |  |
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The gems of citrine quartz at left are 2277 and 277.9 carats and are from Brazil. The larger gem appeared to be about 5 cm across. The gem below is 143.3 carats from Florissant, Colorado.
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From left to right, these citrine quartz gems are described as 55 carats from Keith Quarry, Auburn, Maine and 21.2 and 156.2 carat gems of unknown origin. |  |
 | This specimen of citrine quartz is about 5x6 cm and is from Sete Lagoas, Brazil. |
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This specimen is from Treasury Tunnel, Ouray, Colorado. The sample was about 8x12 cm, of which this is the upper half. |  |
The citrine quartz mineral sample above left is about 2.5x7 cm and is from Madagascar. The gems are 1180 and 781 carats and are from Minas Gerais, Brazil. The largest gem appears to be about 4.5 cm across.
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