Aerinite

Aerinite (Ca₄(Al,Fe,Mg)₁₀Si₁₂O₃₅(OH)₁₂CO₃·12H₂O) is a bright yellow to light brown inosilicate mineral. It crystallizes in the monoclinic system and occurs as fibrous masses and coatings. It has a vitreous luster, a specific gravity of 2.48 and a Mohs hardness of 3.

It is a low temperature hydrothermal phase occurring in zeolite facies alteration of mafic rocks. Associated minerals include prehnite, scolecite and mesolite.

Its name comes from a Greek root "aerinos," meaning "atmosphere" or "sky".

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