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Hydrocalumite & Gonnardite

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HCH118190

Hydrocalumite & Gonnardite

Description Tabs

Description
Locality: 
Zeilberg Quarry, Maroldsweisach, Bavaria, Germany
Size Range: 
Cabinet (10-18 cm)
Size: 
10 × 7.5 × 3 cm
Description

Very rich speciem with small platy white crystals of hydrocalumite in parageneses of botryoidal gonnardite up to 3 mm diameter and some sprays of thaumasite up to 1 mm large on basalt.

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

Gonnardite

Formula: 
(Na,Ca)2(Si,Al)5O10·3H2O
Strunz: 
9.GA.05
Hardness: 
4.0 - 5.0
Type Locality: 
La Chaux de Bergonne, Gignat, Saint-Germain-Lembron, Puy-de-Dôme, Auvergne, France

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