Milky 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. One of many varieties of quartz is an opaque white variety called milky quartz. The sample at right is about 35 cm wide and is from Mineral Park, Colorado. |  |
 The above sample is about 15 cm wide and is from Carrara, Toscana, Italy. The sample at right is over a meter high. |  |
| Minerals |
| HyperPhysics***** Geophysics | R Nave |