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Sellaite Topaz & Mullite

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CSL102171

Sellaite Topaz & Mullite

Rare Mineral

Description Tabs

Description
Locality: 
Wannenköpfe Quarry, Ochtendung, Maifeld, Mayen-Koblenz, Rhineland-Palatinate, Germany
Size Range: 
Thumbnail (1-3cm)
Size: 
1.7 × 1.1 × 1.2 cm
Description

Uncommon mineral association from Eifel Mts. A small piece of vuggy xenolite features white elongated crystals of rare Mg-fluoride mineral sellaite, pale yellow sprays of topaz and white fibrous mullite. There are some blocky, colourless crystals of nosean in the mineralization.

Mineral Data
What's on the rock

Sellaite

Formula: 
MgF2
Strunz: 
3.AB.15
Crystal System: 
Tetragonal
Hardness: 
5.0 - 5.5
Streak: 
White
Type Locality: 
Gébroulaz glacier, Val Thorens, Savoie, Rhône-Alpes, France

Topaz

Formula: 
Al2(SiO4)(F,OH)2
Strunz: 
9.AF.35
Crystal System: 
Orthorhombic - Dipyramidal
Hardness: 
8.0
Streak: 
White

Mullite

Formula: 
Al4+2xSi2-2xO10-x
Strunz: 
9.AF.20
Crystal System: 
Orthorhombic
Hardness: 
6.0 - 7.0
Type Locality: 
Seabank Villa, Isle of Mull, Strathclyde (Argyllshire), Scotland, UK
Loranth Minerals

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