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Mullite & Osumilite

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SKY187790

Mullite & Osumilite

Classic Locality

Description Tabs

Description
Locality: 
Bellerberg, Ettringen, Eifel Mountains, Rhineland-Palatinate, Germany
Size Range: 
Thumbnail (1-3cm)
Size: 
2.2 × 1.3 × 1.3 cm
Description

Spherical aggregate of hairy deep violet mullite crystals in a nice disposition associated to tabular rounded osumilite crystals. From the Mineralogical Record's article March-April 2013, p.169: "Without question, mullite-bearing clay-rich xenoliths are among the most sought after objects at Bellerberg" !

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

Osumilite

Formula: 
(K,Na)(Fe2+,Mg)2(Al,Fe3+)3(Si,Al)12O30
Strunz: 
9.CM.05
Hardness: 
5.0 - 6.0
Colour: 
Blue
Type Locality: 
Sakkabira, Osumi Peninsula, Kagoshima Prefecture, Kyushu Region, Japan

Seller Information

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