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Stilbite & Calcite

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RPL524724

Stilbite & Calcite

Fluorescent

Description Tabs

Description
Locality: 
Dean Quarry, St Keverne, Cornwall, United Kingdom
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
2.5 × 5 × 3.5 cm
Largest Crystal: 
1.00cm
Weight: 
100.00gr
Description

A thin dolerite matrix is covered by pearly white calcite rhombs which are partially overgrown by stilbite. The stilbite has also formed epimorphs after natrolite, some are complete and terminated, others are broken to reveal hollow interiors. Some of the stilbite has a slight pink hue.

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

Calcite

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

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