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Harmotome

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SKY812081

Harmotome

Rare Mineral

Description Tabs

Description
Locality: 
Martinique, France
Class: 
Crystal Group/Cluster
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.5 × 3 × 1.5 cm
Description

Outstanding crystal group of harmotome from the island of Martinique, an island that belongs to France, in a locality still not uploaded to Mindat.

Ex Vandenbroucke Museum collection specimen, from Waregem, Belgium.

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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