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Goethite & Harmotome

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CR749830

Goethite & Harmotome

Classic Locality

Description Tabs

Description
Locality: 
Idar-Oberstein, Birkenfeld, Rhineland-Palatinate, Germany
Class: 
Crystals on Matrix
Size Range: 
Cabinet (10-18 cm)
Size: 
10 × 4.3 × 4.5 cm
Weight: 
240.00gr
Description

This is a very atteactive and old time specimen from the famous Idar-Oberstein .

A large and lustrous spray of goethite crystals with beautiful white harmotome crystals on top, filling a vug of smoky quartz crystals.

 

Mineral Data
What's on the rock

Goethite

Formula: 
α-Fe3+O(OH)
Strunz: 
4.00.
Crystal System: 
Orthorhombic
Hardness: 
5.0 - 5.5
Type Locality: 
Hollertszug Mine (Hollerter Zug Mine), Dermbach, Herdorf, Siegerland, Rhineland-Palatinate, Germany

Harmotome

Formula: 
(Ba0.5,Ca0.5,K,Na)5[Al5Si11O32] ·12H2O
Strunz: 
9.GC.10
Crystal System: 
Monoclinic
Hardness: 
4.0 - 5.0
Streak: 
White
Type Locality: 
St Andreasberg, St Andreasberg District, Harz, Lower Saxony, Germany