Creedite

Rarity: Common

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Notion

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Science and technology

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What Wikipedia says

Creedite is a halide mineral with the chemical 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.

Excerpt from the Wikipedia article “Creedite”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Didier Desouens, CC BY-SA 3.0, via Wikimedia Commons.