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Astrophyllite

#DP34933
SOLD
Astrophyllite from Poudrette quarry, Mont Saint-Hilaire, Montérégie, Québec, Canada - DP34933
Astrophyllite from Poudrette quarry, Mont Saint-Hilaire, Montérégie, Québec, Canada - DP34933

Astrophyllite

#DP34933
Availability
Sold
Size
5.5 x 3.5 x 2 cm - Sm Cabinet 
Formula
K2NaFe2+7Ti2(Si4O12)2O2(OH)4F (RRUFF)
Locality
Poudrette quarry, Mont Saint-Hilaire, Montérégie, Québec, Canada

Astrophyllite is an inosilicate with a {010} perfect cleavage. This specimen shows beautiful groups of radial bronze, bladed crystals 6mm resembling a mica in Albite matrix. However, it is not phyllosilicate and thus not a mica either. It typically occurs in pegmatites, nepheline syenites and alkaline granites such as Mont Saint-Hilaire, 

Astrophyllite

Formula
K2NaFe2+7Ti2(Si4O12)2O2(OH)4F 
Crystal System
Triclinic 
Crystal Habit
Bladed, Stellate, Crystalline - Fine 
Cleavage
Perfect, None, None 
Luster
Adamantine - Pearly 
Color
brown, brownish red, bronze yellow, gold yellow 
Streak
yellowish brown 
Class
Triclinic - Pedial 
Fracture
Brittle 
Hardness
3-3.5 

Data courtesy of Webmineral.

Collection
Polak Collection
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