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Natrolite On Gmelinite

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PCZ123238

Natrolite On Gmelinite

Type Locality

Description Tabs

Description
Locality: 
Little Deerpark Quarry, Glenarm, County Antrim, Northern Ireland, United Kingdom
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3 × 3.5 × 3 cm
Description

A lovely example of this combination. A few good coloured gmelinite crystals (type locality) to 0.4cm along with two radiating 'balls' of stocky, well terminated natrolite crystals, the largest of these two is 2.0cm across. Sparkles like a disco ball in the light. Great specimen.

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

Gmelinite

Synonym Of: 

Gmelinite-Ca

Formula: 
(Ca,Na2)[Al2Si4O12]·6H2O
Strunz: 
9.GD.05
Hardness: 
4.5

Gmelinite-K

Formula: 
(K2,Na2,Ca)[Al2Si4O12]·6H2O
Strunz: 
9.GD.05
Hardness: 
4.5

Gmelinite-Na

Formula: 
(Na2,Ca)[Al2Si4O12]·6H2O
Strunz: 
9.GD.05
Hardness: 
4.5
Group Parent: 
Zeolite Group
Peter Crozier Minerals