Selenite
石英
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These samples of selenite are displayed in the Smithsonian Museum of Natural History. Selenite is a name given to clear crystals of gypsum, as contrasted with the milky, translucent gypsum that usually forms as evaporative deposits. The name comes from the Greek selene, meaning "moon", a reference to the whitish reflections off the crystal faces. Selenite exhibits beautiful crystals, but they are too soft to be considered as gemstones. 这些石英晶体陈列在史密森尼自然历史博物馆中。石英晶体是一种名为石英的透明晶体，与通常形成于蒸发沉积的乳白色、半透明的石膏形成对比。该名称源自希腊语“selene”，意为“月亮”，指的是晶体表面的银白色反光。石英晶体具有美丽的晶体结构，但因其太软，不被视为宝石。
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The columns above left are 40 to 50 cm long. That sample is from Maravilla mine, Naica, Chihuahua, Mexico. The sample above right is about 10x16 cm and is from Agrigento, Sicilia, Italy. It is formed with sulfur. The composition of gypsum is CaSO4.2H2O.
Mindat: Selenite
Mindat: 赤铁矿
| Minerals
矿物 |
左上方的柱体长度为40至50厘米，采自墨西哥奇瓦瓦州纳伊卡矿。右上方的样本约为10×16厘米，采自意大利西西里岛阿格里根托，其成分含硫。石膏的化学式为CaSO₄·2H₂O。
索引
| HyperPhysics*****Geophysics
HyperPhysics ***** 地球物理学 | R Nave |
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