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Tephroite

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JYJ626552

Tephroite

Description Tabs

Description
Locality: 
Laacher See, Glees, Rhineland-Palatinate, Germany
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
1.3 × 1.11 × 0.8 cm
Description

Brown red tephroite crystals on sanidine matrix. This mineral often occurs only as masses or fillings but rarely in crystals. 

 

References:

Hentschel, G., Die Mineralien der Eifelvulkane, Weise Verlag, München, 1983

Mineral Data
What's on the rock

Tephroite

Formula: 
Mn2+2SiO4
Strunz: 
9.AC.05
Crystal System: 
Orthorhombic Forms short prismatic crystals.
Hardness: 
6.0
Streak: 
Pale gray
Type Locality: 
Sterling Mine, Sterling Hill, Ogdensburg, Franklin Mining District, Sussex Co., New Jersey, USA