Sapphirine

Rarity: Common

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What Wikipedia says

Sapphirine is a rare mineral, a silicate of magnesium and aluminium, with the chemical formula (Mg,Al)8(Al,Si)6O20 (with iron as a major impurity).

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

Image: Géry Parent, Copyrighted free use, via Wikimedia Commons.