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Helvine With Hilairite

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QRI1077765

Description Tabs

Description
Locality: 
Bratthagen 2, Lågendalen, Larvik, Vestland, Norway
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
2.5 × 1.8 × 1.4 cm
Weight: 
10.00gr
Description

Rich pegmatoid vug hosting microscopic helvite and hilairite crystals, associated to hematite.
Best appreciated at 10x magnification. In my collection since 20+ years.

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

Hilairite

Formula: 
Na2Zr[SiO3]3·3H2O
Strunz: 
9.DM.10
Hardness: 
4.5
Type Locality: 
Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada

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