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  2. Collectible minerals
  3. Andalusite

Collectible minerals - full range in stock "Andalusite"

Andalusite is a mineral that has a trimorphic composition (the same chemical formula for the minerals kyanite and sillimanite). It is usually metamorphic in nature, but can also be found in igneous rocks. Has several varieties.

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

Physical properties of Andalusite

General
Category Nesosilicates
Formula
(repeating unit)		 Al2SiO5
IMA symbol And
Strunz classification 9.AF.10
Crystal system Orthorhombic
Crystal class Dipyramidal (mmm)
H-M symbol: (2/m 2/m 2/m)
Space group Pnnm
Unit cell a = 7.7980 Å, b = 7.9031 Å
c = 5.5566 Å; Z = 4
Identification
Color Pink, violet, yellow, green, white, gray; in thin section, colorless to pink or green
Crystal habit As euhedral crystals or columnar aggregates having nearly square cross sections; fibrous compact to massive
Twinning On {101}, rare
Cleavage Good on {110}, poor on {100}
Fracture uneven to subconchoidal
Mohs scale hardness 6.5 - 7.5
Luster Vitreous
Streak White
Diaphaneity Transparent to nearly opaque with inclusions
Specific gravity 3.17 (+/- .04)
Optical properties double refractive, biaxial negative; chiastolite has anomalous aggregate reaction.
Refractive index nα = 1.629 - 1.640 nβ = 1.633 - 1.644 nγ = 1.638 - 1.650
Birefringence δ = 0.009 - 0.010
Pleochroism strongly trichroic
2V angle 71 - 86°
Dispersion r < v strong
Ultraviolet fluorescence non-fluorescent


  

Chiastolite
Code: 4283
Chiastolite
Keivy, Kola Peninsula, RF
45*42*27mm

0.00 $ $45.00

Chiastolite
Code: 4284
Chiastolite
Keivy, Kola Peninsula, RF
62*44*23mm

0.00 $ $26.33

Chiastolite
Code: 4233
Chiastolite
Keivy, Kola Peninsula, RF
59*53*18mm

0.00 $ $65.00

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