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#creedite

Creedite

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.

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Creedite List of gemstones by species List of minerals Mineral collecting Acicular (crystal habit) Primary mineral List of mineral symbols Halide mineral List of minerals recognized by the International Mineralogical Association (C) Sulfate fluoride
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