Margarite

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What Wikipedia says

Margarite is a calcium rich member of the mica group of the phyllosilicates with formula: CaAl2(Al2Si2)O10(OH)2. It forms white to pinkish or yellowish gray masses or thin laminae. It crystallizes in the monoclinic crystal system. It typically has a specific gravity of around 3 and a Mohs hardness of 4.

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

Image: Robert M. Lavinsky, CC BY-SA 3.0, via Wikimedia Commons.