Afwillite

Rarity: Common

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Science and technology

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What Wikipedia says

Afwillite is a calcium hydroxide nesosilicate mineral with formula Ca3(SiO3OH)2·2H2O. It occurs as glassy, colorless to white prismatic monoclinic crystals. Its Mohs scale hardness is between 3 and 4. It occurs as an alteration mineral in contact metamorphism of limestone.

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

Image: Matteo Chinellato, CC BY-SA 3.0, via Wikimedia Commons.