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Harmotome

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SER991779

Harmotome

ex Americo Urbinati collection

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Description
Locality: 
Bellsgrove Mine, Strontian, Highland, Scotland, United Kingdom
Class: 
Crystal Group/Cluster
Size Range: 
Miniature (4.5-7 cm)
Size: 
4.6 × 4.4 × 1.1 cm
Description

a complete coverture of white, lustrous harmotome crystals

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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Start 23 Apr 18:00
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