Aerinite

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What Wikipedia says

Aerinite (Ca4(Al,Fe,Mg)10Si12O35(OH)12CO3·12H2O) is a bluish-purple inosilicate mineral. It crystallizes in the monoclinic system and occurs as fibrous or compact masses and coatings. It has a dark, vitreous luster, a specific gravity of 2.48 and a Mohs hardness of 3.

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

Image: Joan Rosell, CC BY-SA 4.0, via Wikimedia Commons.