Moving mountains for you
Switch currency

Current Live Auctions

Current Live Fixed Price Sales

Natrolite On Gonnardite

Views:
Watches:
PCZ127246

Natrolite On Gonnardite

Description Tabs

Description
Locality: 
Port Muck, Island Magee, County Antrim, Northern Ireland, United Kingdom
Size Range: 
Small cabinet (7-10 cm)
Size: 
9.5 × 9 × 4 cm
Description

Much of the natrolite from the region grows on balls of white gonnardite which can only be seen at cleavage points. This specimen differs as the well terminated natrolite crystals are so clear that the gonnardite centres can be seen through them. The two vugs are 3.5 and 2cm across. Other areas of gmelinite crystallization are present.

Mineral Data
What's on the rock

Natrolite

Formula: 
Na2Al2Si3O10·2H2O
Strunz: 
9.GA.05
Hardness: 
5.0 - 5.5
Streak: 
White
Type Locality: 
Hohentwiel, Singen, Hegau, Baden-Württemberg, Germany

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
Item Toolbox