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Spinel Batavite & Hornblende

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CLB598756

Spinel Batavite & Hornblende

Classic Locality

Description Tabs

Description
Locality: 
Kropfmühl District, Untergriesbach, Lower Bavaria, Bavaria, Germany
Class: 
Combination
Size Range: 
Small cabinet (7-10 cm)
Size: 
8.6 × 5.6 × 5.4 cm
Description

An interesting, old specimen and one-of-a-kind find: the whole specimen consists of hundreds of assembled, pinkish spinel crystals with greenish hornblende and a few batavite crystals (a vermiculite variety).

Mineral Data
What's on the rock

Spinel

Formula: 
MgAl2O4
Strunz: 
4.BB.05
Crystal System: 
Isometric
Hardness: 
7.5 - 8.0

Batavite

Variety Of: 

Vermiculite

Formula: 
(Mg,Fe,Al)3((Al,Si)4O10)(OH)2·4H2O
Strunz: 
9.EC.50
Hardness: 
1.5 - 2.0
Crystal System: 
Monoclinic
Hardness: 
0.0

Hornblende

Synonym Of: 

Ferro-hornblende

Formula: 
☐{Ca2}{Fe2+4Al}(AlSi7O22)(OH)2
Strunz: 
9.DE.10
Hardness: 
5.0 - 6.0

Magnesio-hornblende

Formula: 
☐{Ca2}{Mg4Al}(AlSi7O22)(OH)2
Strunz: 
9.DE.10
Hardness: 
5.0 - 6.0

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