Contacts
Moscow, Russia
Shipping: worldwide
We work 7 days a week
Orders are accepted
around the clock
Product search
Diameter, mm (1mm - 0,039inch)

Biotite mineral - You can buy these samples

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

0.00 $ $23.64

Code: 2103
Afrikanda, Kola Peninsula, RF
42*55*4mm

0.00 $ $5.45

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

0.00 $ $4.73

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

0.00 $ $4.73

I want to receive information about new products