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Biotite

#60841
SOLD
Biotite from Mt. Vesuvius, Somma Complex, Napoli, Campania, Italy - 60841
Biotite from Mt. Vesuvius, Somma Complex, Napoli, Campania, Italy - 60841

Biotite

#60841
Availability
Sold
Size
5 x 4 x 3.5 cm - Miniature 
Formula
K(Mg,Fe)3AlSi3O10(OH)2 (RRUFF)
Locality
Mt. Vesuvius, Somma Complex, Napoli, Campania, Italy

Black micaceous Biotite in aggregatewith crystals to 8mm.

Biotite

Formula
K(Mg,Fe++)3[AlSi3O10(OH,F)2 
Crystal System
Monoclinic 
Crystal Habit
Micaceous, Lamellar, Pseudo Hexagonal 
Cleavage
Perfect, None, None 
Luster
Vitreous - Pearly 
Color
dark brown, greenish brown, blackish brown, yellow, white 
Streak
gray 
Class
Monoclinic - Prismatic 
Fracture
Uneven 
Hardness
2.5-3 

Data courtesy of Webmineral.

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