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Osumilite-(Mg)

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ZLT888176

Osumilite-(Mg)

Description Tabs

Description
Locality: 
Nickenicher Weinberg, Nickenich, Andernach, Mayen-Koblenz, Rhineland-Palatinate, Germany
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
1 × 1.1 × 0.9 cm
Description

A group of osumilite crystals (FOV 1.7 mm)in a vug of a xenolith. The crystals are strong dichroitic, dark blue in direction of c-axis and pale yellow in the direction of other axis and so transparent that the background causes additional a red hue. Some black hematite and tabular, blue osumilite is also present.

Mineral Data
What's on the rock

Osumilite-(Mg)

Formula: 
KMg2Al3(Al2Si10)O30
Strunz: 
9.CM.05
Hardness: 
5.0 - 6.0
Type Locality: 
Caspar quarry, Bellerberg volcano, Ettringen, Mayen, Eifel, Rhineland-Palatinate, Germany

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