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Gmelinite Natrolite Analcime & Calcite

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Gmelinite Natrolite Analcime & Calcite

Classic Locality

Description Tabs

Description
Locality: 
Little Deerpark Quarry, Glenarm, County Antrim, Northern Ireland, United Kingdom
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
5 × 3.5 × 3.7 cm
Description

Basalt matrix with an amygdale lined with nice bright orange gmelinite crystals and colourless natrolite, analcime and calcite crystals. The Little Deer Park Quarry was formerly the gmelinite Type Locality before the reorganistion of the gmelinite group minerals a few years ago. In my opinion its still the best locality for collecting the mineral, offering a wide variety of crystal habits and colours. But perhaps I'm biased!

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

Natrolite

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

Analcime

Formula: 
Na2(Al2Si4O12)·2H2O
Strunz: 
9.GB.05
Crystal System: 
Triclinic
Hardness: 
5.0 - 5.5
Streak: 
White
Type Locality: 
Cyclopean Islands, Acitrezza (Aci Trezza), Etna Volcanic Complex, Catania Province, Sicily, Italy

Calcite

Polymorph of: 
Formula: 
CaCO3
Strunz: 
5.AB.05
Crystal System: 
Trigonal
Hardness: 
3.0
Streak: 
White

Seller Information

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