mineral specimens
rare minerals
mineral dealer
systematic minerals
Black Hills minerals
fine minerals
mineral dealer
Dana minerals
IMA minerals
mineral collections
rock and minerals
gem crystal
0 item @ $0.00  

Astrophyllite

#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
Mont Saint-Hilaire, Rouville Co., Quebec, 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)4
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

All photos by Dakota Matrix and are Copyrighted © and may not be used without permission. Copyright © 2019 - Dakota Matrix Minerals, Inc. Privacy | Terms & Conditions | Site Map