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Gonnardite With Mica

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PCZ679745

Gonnardite With Mica

Description Tabs

Description
Locality: 
Allt a'Mhuillin Quarry, Loch Borralan, Highland, Scotland, United Kingdom
Class: 
Massive/Crystalline
Size Range: 
Miniature (4.5-7 cm)
Size: 
5 × 3.8 × 3 cm
Description

An interesting specimen for the zeolite collectors. Uncommon massive white gonnardite with dark biotite mica. Originating from a alkaline syenite pegmatite in the disused Allt a' Mhuillin quarry. This is a rare occurrence and, these specimens are the first reported UK examples from a non-basaltic host rock. 

Mineral Data
What's on the rock

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

Mica

Group Parent: 
Mica Group
Peter Crozier Minerals