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Helvine

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MCH116904

Helvine

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Description
Locality: 
Tvedalen, Larvik, Vestfold og Telemark, Norway
Size Range: 
Thumbnail (1-3cm)
Size: 
1.1 × 0.5 × 0.5 cm
Description

Cluster of orange coloured helvite crystals.

The original label of the specimen says „genthelvite“ (the Zn-member of the helvite-group minerals). Recent studies on different genthelvite occurences in the Langesundsfjord area (Tvedalen is a part of it) showed that in almost all cases the „genthelvite“ is more of helvite-type, however. Therefore I relabeled this specimen to „helvite“

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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