Ametrine Quartz

铵石英

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. Ametrine quartz is one of the noted varieties of quartz, and is often of gem quality. The gem at right is 138.7 carats from Anahi mine, Santa Cruz, Bolivia. The sample beside it is is about 3x2.5 cm in size.

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。Ametrine石英是石英的一种著名品种，常具有宝石品质。右边的宝石来自玻利维亚圣克鲁兹的Anahi矿，重138.7克拉。它旁边的样本大小约为3×2.5厘米。