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  2. Collectible minerals
  3. Biotite

Collectible minerals - full range in stock "Biotite"

Biotite is a widespread mineral (up to 3% of the earth's crust), potassium-aluminum-magnesium-iron-containing variety of mica.

You can see biotite stone for sale and buy it in the Minerals of Russia online store.

Physical properties of Biotite

General
Category Phyllosilicate
Formula
(repeating unit)		 K(Mg,Fe)3(AlSi3O10)(F,OH)2
IMA symbol Bt
Crystal system Monoclinic
Crystal class Prismatic (2/m)
(same H-M symbol)
Space group C2/m
Identification
Color Dark brown, greenish-brown, blackish-brown, yellow
Crystal habit Massive to platy
Twinning Common on the [310],
less common on the {001}
Cleavage Perfect on the {001}
Fracture Micaceous
Tenacity Brittle to flexible, elastic
Mohs scale hardness 2.5–3.0
Luster Vitreous to pearly
Streak White
Diaphaneity Transparent to translucent to opaque
Specific gravity 2.7–3.3
Optical properties Biaxial (-)
Refractive index nα = 1.565–1.625
nβ = 1.605–1.675
nγ = 1.605–1.675
Birefringence δ = 0.03–0.07
Pleochroism Strong
Dispersion r < v (Fe rich);
r > v weak (Mg rich)
Ultraviolet fluorescence None
Major varieties
Manganophyllite K(Fe,Mg,Mn)3AlSi3O10(OH)2
Biotite
Code: 2103
Biotite
Afrikanda, Kola Peninsula, RF
42*55*4mm

0.00 $ $5.00

Biotite
Code: 2684
Biotite
Afrikanda, Kola Peninsula, RF
82*77*14mm

0.00 $ $21.67

Biotite archived
Code: 3264
Biotite
Afrikanda, Kola Peninsula, RF
34*26*5mm

0.00 $ $4.33

Biotite archived
Code: 2519
Biotite
Afrikanda, Kola Peninsula, RF
40*31*10mm

0.00 $ $4.33

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