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

Polished stones - full range in stock "Astrophyllite"

Astrophyllite is an igneous mineral whose name comes from the Greek for "star". The best astrophyllite in the world is mined in Russia, in the Khibiny. It has no practical application, but is appreciated by jewelers.

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

Physical properties of Astrophyllite

Category Inosilicates
Astrophyllite group
(repeating unit)
IMA symbol Ast
Strunz classification 9.DC.05
Crystal system Triclinic
Crystal class Pinacoidal (1)
(same H-M symbol)
Space group A1
Color Golden brown to yellow; rarely greenish
Crystal habit Tabular to bladed, radiating, stellate aggregates; lamellar masses
Cleavage Perfect on [001] imperfect on [100]
Fracture Uneven
Mohs scale hardness 3-4
Luster Greasy, pearly, sub-metallic
Streak Yellowish brown or white
Diaphaneity Translucent to opaque
Specific gravity 3.2–3.4
Optical properties Biaxial positive
Refractive index nα = 1.680 nβ = 1.700 nγ = 1.730
Birefringence 0.050
Pleochroism Strong: X= deep red-orange Y= orange-yellow Z= lemon-yellow

Code: 922
Khibiny, Kola Peninsula, RF

0.00 $ $46.67

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