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  3. Aegirine

Polished stones - full range in stock "Aegirine"

Aegirine is a mineral of the pyroxene group, which is a rock-forming mineral of many igneous rocks. Forms an isomorphic series with augite. Its edges are characterized by longitudinal shading.

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

Physical properties of Aegirine

General
Category Silicate mineral, pyroxene
Formula
(repeating unit)		 NaFe3+[Si2O6]
IMA symbol Aeg
Strunz classification 9.DA.25
Crystal system Monoclinic
Crystal class Prismatic (2/m)
(same H-M symbol)
Space group C2/c
Unit cell a = 9.658, b = 8.795
c = 5.294 [Å], β = 107.42°; Z = 4
Identification
Formula mass 231.00 g/mol
Color Dark Green, Greenish Black
Crystal habit Prismatic crystals may be in sprays of acicular crystals, fibrous, in radial concretions
Twinning Simple and lamellar twinning common on {100}
Cleavage Good on {110}, (110) ^ (110) ≈87°; parting on {100}
Fracture Uneven
Tenacity Brittle
Mohs scale hardness 6
Luster Vitreous to slightly resinous
Streak Yellowish-grey
Diaphaneity Translucent to opaque
Specific gravity 3.50 - 3.60
Optical properties Biaxial (-)
Refractive index nα = 1.720 - 1.778 nβ = 1.740 - 1.819 nγ = 1.757 - 1.839
Birefringence δ = 0.037 - 0.061
Pleochroism X = emerald green, deep green; Y = grass-green, deep green, yellow; Z = brownish green, green, yellowish brown, yellow
2V angle Measured: 60° to 90°, Calculated: 68° to 84°
Dispersion moderate to strong r >
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