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Feldspar Psm Helvine

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SHS71628

Feldspar Psm Helvine

ex. Dr. Wilke (Eppertshausen/Germany)

Description Tabs

Description
Locality: 
Vilui River Basin, Sakha Republic, Russian Federation
Size Range: 
Thumbnail (1-3cm)
Size: 
2.4 × 1.8 × 1.6 cm
Description

A piece of feldspar pseudomorph after helvite

Mineral Data
What's on the rock

Feldspar

Group Parent: 
Feldspar Group

Helvine

Formula: 
Mn2+4(Be3Si3O12)S
Strunz: 
9.FB.10
Crystal System: 
Isometric
Hardness: 
6.0 - 6.5
Streak: 
White
Type Locality: 
Friedefürst Mine, Breitenbrunn, Breitenbrunn District, Erzgebirge, Saxony, Germany