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Osumilite & Mullite

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MEX726702

Osumilite & Mullite

Classic Locality

Description Tabs

Description
Locality: 
Emmelberg, Üdersdorf, Daun, Eifel, Rhineland-Palatinate, Germany
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
2.1 × 1.3 × 0.7 cm
Description

Beautiful dark blue zoned, high-gloss crystals with white mullite tufts on matrix. Depending on the incidence of light, the crystals may show blue internal reflections.

Mineral Data
What's on the rock

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

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