出典:Wiktionary
出典:『Wiktionary』 (2013/01/28 03:16 UTC 版)
Creede + -ite, after Creede, Colorado.
creedite
出典:Wikipedia
出典:『Wikipedia』 (2011/05/07 13:00 UTC 版)
Creedite is a calcium aluminium sulfate fluoro hydroxide mineral with formula: Ca3Al2SO4(F,OH)10·2(H2O). Creedite forms colorless to white to purple monoclinic prismatic crystals. It often occurs as acicular radiating sprays of fine prisms. It is translucent to transparent with indices of refraction of nα = 1.461 nβ = 1.478 nγ = 1.485. It has a Mohs hardness of 3.5 to 4 and a specific gravity of 2.7.