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Hydrocalumite & Afwillite

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SKY658641

Hydrocalumite & Afwillite

Rare Mineral

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: 
3.5 × 3 × 2.5 cm
Description

Outstanding hexagonal colorless hydrocalumite crystals associated to white afwillite.

Ex.-Ralph E. Merrill collection with label included.

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

Afwillite

Formula: 
Ca3(HSiO4)2·2H2O
Strunz: 
9.AG.75
Crystal System: 
Monoclinic:
Hardness: 
3.0 - 4.0
Streak: 
White
Type Locality: 
Dutoitspan Mine, Kimberley, Francis Baard District, Northern Cape Province, South Africa

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