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  3. Kyanite

Polished stones - full range in stock "Kyanite"

Kyanite is a mineral characteristic of metamorphic rocks with a high content of alumina. Also, but much less frequently, it can be present both in igneous rocks and in hydrothermal formations. It has anisotropy of hardness: its hardness is 4.5 along the crystal, and 6.5 across it. As a rule, kyanite crystals are opaque, but sometimes they can have a "cat's eye" effect.

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

Physical properties of Kyanite

General
Category Nesosilicate
Formula
(repeating unit)		 Al2SiO5
IMA symbol Ky
Strunz classification 9.AF.15
Crystal system Triclinic
Crystal class Pinacoidal (1)
(same H-M symbol)
Space group P1
Unit cell a = 7.1262(12) Å
b = 7.852(10) Å
c = 5.5724(10) Å
α = 89.99(2)°, β = 101.11(2)°
γ = 106.03(1)°; Z = 4
Identification
Color Blue, white, rarely green, light gray to gray, rarely yellow, pink, orange, and black, can be zoned
Crystal habit Columnar; fibrous; bladed
Twinning Lamellar on {100}
Cleavage [100] perfect [010] imperfect with 79° angle between
Fracture Splintery
Tenacity Brittle
Mohs scale hardness 4.5-5 parallel to one axis
6.5-7 perpendicular to that axis
Luster Vitreous to white
Streak White
Diaphaneity Transparent to translucent
Specific gravity 3.53 - 3.65 measured; 3.67 calculated
Optical properties Biaxial (-)
Refractive index nα = 1.712 - 1.718 nβ = 1.720 - 1.725 nγ = 1.727 - 1.734
Pleochroism Trichroic, colorless to pale blue to blue
2V angle 78°-83°

Fuchsite, Kyanite
Code: 992
Fuchsite, Kyanite
North Karelia, RF
76*55*22mm

0.00 $ $26.67

Fuchsite, Kyanite
Code: 1377
Fuchsite, Kyanite
North Karelia, RF
108*53*17mm

0.00 $ $33.33

Fuchsite, Kyanite
Code: 2305
Fuchsite, Kyanite
North Karelia, RF
52*56*5mm

0.00 $ $16.67

Fuchsite, Kyanite
Code: 2376
Fuchsite, Kyanite
North Karelia, RF
69*58*5mm

0.00 $ $12.00

Fuchsite, Kyanite
Code: 2 376
Fuchsite, Kyanite
North Karelia, RF
69*58*5mm

0.00 $ $12.00

Fuchsite, Kyanite
Code: 3593
Fuchsite, Kyanite
North Karelia, RF
61*60*16mm

0.00 $ $33.33

Kyanite archived
Code: 4046
Kyanite
North Karelia, RF
67*22*11mm

0.00 $ $16.67

Fuchsite, Kyanite archived
Code: 3018
Fuchsite, Kyanite
North Karelia, RF
87*35*15mm

0.00 $ $20.00

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