Smoky 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. Smoky quartz is one of the noted varieties of quartz, and is often of gem quality. The gem shown at right is 144.9 carats and is from Scotland. 石英是二氧化硅，SiO₂。石英在地壳中很丰富，是硅酸盐中化学最简单的形式。所有这些样本都陈列在史密森尼自然历史博物馆中。烟熏石英是石英的一种著名品种，通常具有宝石品质。右边展示的宝石重144.9克拉，来自苏格兰。 |  |
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 | The gem of smoky quartz at left is 63 carats and is from Stoneham, Maine. The stone second from left is 90 carats and is from Berner Alp, Tschingelhorn, Switzerland 左下方的烟熏石宝石重63克拉，来自缅因州斯通汉。从左数第二块石重90克拉，来自瑞士楚宁格霍恩的伯恩阿尔普。 |
 | This specimen of smoky quartz is about 5x5 cm and is from Berner Alp, Tschingelhorn, Switzerland. 这块烟熏石英的尺寸约为5厘米见方，采自瑞士伯恩阿尔普地区的Tschingelhorn。 |
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The gem shown at right is about 5x3.5 cm, 1695 carats. It is from Minas Gerais, Brazil. 右边所示的宝石尺寸约为5x3.5厘米，重1695克拉。它来自巴西的米纳斯吉拉斯州。 |  |
This sample of dark smoky quartz is in a bed of microcline. The sample is about 15 cm wide and is from Crystal Peak, Colorado.
| Quartz with other minerals
含其他矿物的石英 |
| Minerals
矿物 |
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