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Stilbite Psm Natrolite

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RPL689566

Stilbite Psm Natrolite

Description Tabs

Description
Locality: 
Dean Quarry, St Keverne, Cornwall, United Kingdom
Class: 
Crystals on Matrix
Size Range: 
Small cabinet (7-10 cm)
Size: 
7.5 × 4.5 × 2.5 cm
Largest Crystal: 
1.50cm
Weight: 
80.00gr
Description

Micro cream stilbite has formed over natrolite. Broken crystals show in some the natrolite remains, but in many it has partially dissolved or gone to leave an epimorph after natrolite. The base is calcite on gabbro.

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

Stilbite

Synonym Of: 

Stilbite-Ca

Formula: 
NaCa4[Al9Si27O72]·nH2O
Strunz: 
9.GE.10
Hardness: 
3.5 - 4.0

Stilbite-Na

Formula: 
(Na,Ca,K)6-7[Al8Si28O72]·nH2O
Strunz: 
9.GE.10
Hardness: 
3.5 - 4.0
Hardness: 
3.5 - 4
Colour: 
White
Streak: 
White

Natrolite

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

Seller Information

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