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Hydrocalumite

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PDM590951

Hydrocalumite

Description Tabs

Description
Locality: 
Boisséjour, Ceyrat, Clermont-Ferrand, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
Class: 
Crystals on Matrix
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.1 × 2.7 × 2.5 cm
Largest Crystal: 
0.15cm
Description

This specimen features 20+ snow-white, very well defined crystals of hydrocalumite on matrix, where the monoclinic morphology is clearly recognized. This rare carbonated hydroxide is found as good crystals in a handful localities only.

Acquired in 2005, it is an Ex. Bob Janssens (BE) specimen, #2193.

Mineral Data
What's on the rock

Hydrocalumite

Formula: 
Ca4Al2(OH)12(Cl,CO3,OH)2·4H2O
Strunz: 
4.FL.10
Hardness: 
3.0
Type Locality: 
Scawt Hill, Larne, Co. Antrim, Northern Ireland, UK

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