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Anthophyllite

#PD34726

Anthophyllite

#PD34726
Availability
Sold
Size
4 x 3 x 2.5 cm - Miniature 
Formula
□Mg7Si8O22(OH)2 (RRUFF)
Locality
Ilmen Mountains, Chelyabinsk, Southern Urals, Russia

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.

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

This specimen is a tight aggregate as that described above.

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 

Data courtesy of Webmineral.

Collection
Phillips Collection

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