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Helvine

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CFL597271

Helvine

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Description
Locality: 
Schwarzenberg, Erzgebirge, Saxony, Germany
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
4.5 × 4.4 × 4 cm
Largest Crystal: 
1.40cm
Weight: 
120.00gr
Description

Old specimen of a 1.2 cm helvine crystal in matrix.  Ex-Harold C. Buckelew (1889-1970) specimen (label), and ex-J. Cilen (1916-1997) specimen (label #4240). 

Mineral Data
What's on the rock

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

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