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Diameter, mm (1mm - 0,039inch)

Fluorescent Minerals (UV) "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

Category Nesosilicates
(repeating unit)
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
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


Code: 4283
Keivy, Kola Peninsula, RF

0.00 $ $45.00

Code: 4284
Keivy, Kola Peninsula, RF

0.00 $ $26.33

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