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Roméite Piemontite & Braunite

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SER1074394

Roméite Piemontite & Braunite

Type Locality

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Description
Locality: 
Praborna Mine, Saint-Marcel, Aosta Valley, Italy
Class: 
Crystal Group/Cluster
Size Range: 
Thumbnail (1-3cm)
Size: 
2.5 × 2.1 × 1.7 cm
Description

three type locality minerals  in this little specimen : yellow octahedron of romeite, dark red prisms of piemontite and black lustrous braunite crystals too

Mineral Data
What's on the rock

Piemontite

Formula: 
{Ca2}{Al2Mn3+}(Si2O7)(SiO4)O(OH)
Strunz: 
9.BG.05
Hardness: 
6.0 - 6.5
Streak: 
Reddish
Type Locality: 
Prabornaz Mine (Praborna Mine), Saint-Marcel, Aosta Valley, Italy

Braunite

Formula: 
Mn2+Mn3+6(SiO4)O8
Strunz: 
9.AG.05
Hardness: 
6.0 - 6.5
Streak: 
Black
Type Locality: 
Oehrenstock (Öhrenstock), Langewiesen, Ilmenau District, Thuringian Forest, Thuringia, Germany

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Start 29 Apr 18:00
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