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Phengite & Braunite

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SER872285

Phengite & Braunite

Description Tabs

Description
Locality: 
Montaldo Mine, Borgata Oberti, Cuneo Province, Piedmont, Italy
Class: 
Crystal Group/Cluster
Size Range: 
Thumbnail (1-3cm)
Size: 
2.2 × 1.5 × 0.4 cm
Description

hundreds red phengite crystals on a matrix of crystalline braunite

Mineral Data
What's on the rock

Phengite

Variety Of: 

Muscovite

Formula: 
KAl2(AlSi3O10)(OH)2
Strunz: 
9.EC.15
Hardness: 
2.5
Hardness: 
0.0

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