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Osumilite-(Mg) & Hematite

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ZLT888347

Osumilite-(Mg) & Hematite

Description Tabs

Description
Locality: 
Nickenicher Weinberg, Nickenich, Andernach, Mayen-Koblenz, Rhineland-Palatinate, Germany
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
0.4 × 1.5 × 1.2 cm
Description

Prismatic, dichroitic (blue-yellow) crystal (FOV 1.7 mm) of osumilite-(Mg) and tabular, black hematite with sanidine in a vug of a xenolith. The same specimen shows also a dichroitic (blue-yellow) rosette of osumilite-(Mg) crystals (FOC 1.7 mm)

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

Hematite

Formula: 
Fe2O3
Strunz: 
4.CB.05
Crystal System: 
Trigonal
Hardness: 
5.0 - 6.0

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