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Mullite & Biotite

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ZLT165320

Mullite & Biotite

Description Tabs

Description
Locality: 
Bellerberg, Ettringen, Eifel Mountains, Rhineland-Palatinate, Germany
Size Range: 
Thumbnail (1-3cm)
Size: 
1 × 1.2 × 0.5 cm
Description

Small fraction of a xenolith with a 1.5 mm cluster of violet mullite as aciculer crystals and some biotite.
From 1994.

Mineral Data
What's on the rock

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

Biotite

Group Parent: 
Mica Group

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