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Heulandite-Ca With Mordenite

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BSM666938

Heulandite-Ca With Mordenite

ex Dr. Stephen Moreton specimen

Description Tabs

Description
Locality: 
Hightown Quarry, County Antrim, Northern Ireland, United Kingdom
Class: 
Crystal Group/Cluster
Size Range: 
Miniature (4.5-7 cm)
Size: 
3.5 × 4.5 × 6 cm
Description

Formerly a large amygdale within a basalt matrix this specimen is now an open geode with very little matrix present, lined with a thin layer of snow whire mordenite and richly developed highly lustrous heulandite crystals and very minor stilblite.

Previous labels supplied (not photographed)
Mineral Data
What's on the rock

Heulandite-Ca

Formula: 
(Ca,Na)2-3Al3(Al,Si)2Si13O36·12H2O
Strunz: 
9.GE.05
Hardness: 
3.5 - 4.0
Streak: 
White
Type Locality: 
Strathclyde (Dunbartonshire), Scotland, UK

Mordenite

Formula: 
(Na2,Ca,K2)Al2Si10O24·7H2O
Strunz: 
9.GD.35
Hardness: 
3.0 - 4.0
Streak: 
White
Type Locality: 
Morden, Bay of Fundy, Kings Co., Nova Scotia, Canada

Seller Information

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