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Harmotome

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MCH190409

Harmotome

Type Locality

Description Tabs

Description
Locality: 
St Andreasberg, Goslar, Lower Saxony, Germany
Size Range: 
Small cabinet (7-10 cm)
Size: 
8.2 × 5.2 × 4.5 cm
Description

A classic specimen of ´Kreuzstein´ (as harmotome was called in the early 19th century) from its type locality Andreasberg. The specimen hosts several dozens of lustrous, up to 0.7 cm sized, mostly twinned crystals, several of them showing the cross-shaped habitus. Top specimen followed by its antique label.

Mineral Data
What's on the rock

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

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