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Prehnite

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JRM1083067

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Description
Locality: 
Dean Quarry, St Keverne, Cornwall, United Kingdom
Class: 
Crystals on Matrix
Size Range: 
Cabinet (10-18 cm)
Size: 
11 × 7 × 4 cm
Weight: 
528.00gr
Description

Typical green botryoidal prehnite on an earlier layer of calcite, partially overgrown with star shaped glassy white natrolite aggregates - on matrix

Pretty specimen - unusual in this size

Prehnite was probably the least common mineral from this well known quarry (now closed) on the Lizard penisula

Mineral Data
What's on the rock

Prehnite

Formula: 
Ca2Al2Si3O10(OH)2
Strunz: 
9.DP.20
Hardness: 
6.0 - 6.5
Streak: 
White
Type Locality: 
Karoo dolerites, Cradock, Chris Hani District, Eastern Cape Province, South Africa

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£4.89
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