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Gmelinite

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PCZ760792

Gmelinite

Type Locality

Description Tabs

Description
Locality: 
Little Deerpark Quarry, Glenarm, County Antrim, Northern Ireland, United Kingdom
Class: 
Crystals on Matrix
Size Range: 
Small cabinet (7-10 cm)
Size: 
8 × 7 × 5.5 cm
Description

Little Deer Park is arguably the best locality worldwide for gmelinite and specimens are very hard to find these days. This is one of a very few I collected last wekend and consists of numerous, reflective transparent/transluent crystals in basalt (the main cavity is 4.0 cm wide). The majority of crystals from this locality are opaque and only the smaller ones like these are transparent/transluent. In addition there is a nice doubly terminated calcite present which is very rare at this site. All in all a nice, interesting, and uncommon specimen from a classic locality.

Mineral Data
What's on the rock

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
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