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Mineralpedia Details for Anthophyllite

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Anthophyllite

Anthophyllite

Formula
[box]Mg7Si8O22(OH)2 
Crystal System
Orthorhombic 
Crystal Habit
Fibrous, Lamellar, Massive 
Cleavage
Perfect, Distinct, Distinct 
Luster
Vitreous - Pearly 
Color
white, greenish gray, green, clove brown, brownish green 
Streak
gray 
Class
Orthorhombic - Dipyramidal 
Fracture
Conchoidal 
Hardness
5-6 
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Anthophyllite from Søndeled, Risør, Aust-Agder, Norway

Anthophyllite
            from Søndeled, Risør, Aust-Agder, Norway

A tightly compacted of bladed micaceous-like crystals to 2cm. 

Anthophyllite is not a Mica, nor a phyllosilicate. Anthophyllite is a inosilicate - 2D infinite chains of silicate tetrahedra, which, morphologically resemble a phyllosilicate network. Anthophyllite occurs as bladed aggregates, much like this specimen, and on a smaller scale shows lamellar with elastic fibers and easy to mistake for a mica mineral. Bladed aggregates have perfect cleavages and are commonly lamellar with elastic fibers which resemble mica cleavages.

Typically found in medium to high grade metamorphic amphibolites and gneisses. Associated with talc, chlorite, and micas. (Handbook of Mineralogy).

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