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Stilbite On Prehnite

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PJM38192

Stilbite On Prehnite

Description Tabs

Description
Locality: 
Propect Quarry, Sydney, New South Wales, Australia
Size Range: 
Miniature (4.5-7 cm)
Size: 
3.3 × 6.9 × 4.2 cm
Description

An attractive combination of translucent tan coloured wheatsheaves of stilbite on a subtley contrasting light green prehnite matrix.
An elegant miniature from this now defunct location in metropolitan Sydney.
I acquired this specimen as part of a small collection from a retired quarry worker in the early 1980's, the quarry had been closed to collecting for nearly a decade then.
Specimen weighs 76 grams

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

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
Earthstones Australia

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