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Gmelinite & Analcime

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CSW140064

Gmelinite & Analcime

Description Tabs

Description
Locality: 
Garron Point, County Antrim, Northern Ireland, United Kingdom
Size Range: 
Cabinet (10-18 cm)
Size: 
10 × 6 × 6.5 cm
Description

Basalt matrix with multiple amygdales containing a number of zeolite species including colourless gmelinite crystals, white analcime crystals, cream thomsonite and white mesolite crystals. The gmelinite crystals are of interest as colourless crystals are a rarity and tend to only occur on the edges of the very narrow gmelinite zone within the Antrim Basalt Formation. In addition there appears to have been 2 growth phases of gmelinite crystals with larger, initial crystals having a secondary growth of smaller crystals in a 'dumbbell' like pattern on the corners of their sides.

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

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

Seller Information

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Thank you for viewing my auctions. It goes without saying that maintaining high standards in both specimen quality and customer service are extremely important to me. If for any reason you are not happy with any aspect of your transaction then please let me know as soon as possible, ideally within 1 week of receiving your specimen. I will happily do all in my power to resolve the situation to your satisfaction. If your specimen is damaged upon delivery simply send me some photos to verify this and I'll provide you with a full refund or a replacement specimen, whichever you prefer. 

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