出典:Wiktionary
出典:『Wiktionary』 (2016/11/01 17:37 UTC 版)
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? + -ite
sellaite (uncountable)
出典:Wikipedia
出典:『Wikipedia』 (2009/04/27 02:45 UTC 版)
Sellaite is a magnesium fluoride mineral with formula: MgF2. It crystallizes in the tetragonal crystal system typically as clear to white vitreous prisms. It may be fibrous and occur as radiating aggregates. It has a Mohs hardness of 5 to 6 and a specific gravity of 2.97 to 3.15. Refractive index values are nω = 1.378 and nε = 1.390.