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Gonnardite

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SPR652611

Gonnardite

Description Tabs

Description
Locality: 
Allt a'Mhuillin Quarry, Loch Borralan, Highland, Scotland, United Kingdom
Class: 
Massive/Crystalline
Size Range: 
Cabinet (10-18 cm)
Size: 
12 × 8 × 4.2 cm
Weight: 
383.00gr
Description

An interesting combination of two rare minerals from an unusual location. Pale blue vishnevite and white gonnardite are intergrown with grey orthoclase and a few specks of black mica. The piece has been polished on one side to better show the relationship between the minerals

Included with the specimen will be an article by Dr. S. Moreton on the analysis of this material and details of the location.

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
Rare-Earth-Crystals

Seller Information

Payment options: offline, paypal_wpp, paypal_wps

Seller's terms and conditions

Payment must be made with 7 days of purchase and items will not be shipped until payment is received.

Full refund if you are not completely satisfied with any purchase and item is returned within 30 days. Buyer to pay return postage costs.

Please ensure you understand specimen size before purchase as I do sell material from micro to cabinet size.