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Stilbite & Prehnite

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PJM35768

Stilbite & Prehnite

Description Tabs

Description
Locality: 
Propect Quarry, Sydney, New South Wales, Australia
Size Range: 
Miniature (4.5-7 cm)
Size: 
3.6 × 5.1 × 3.6 cm
Largest Crystal: 
3.00cm
Description

No not from India, but from metropolitian Sydney. A group of creamy coloured wheat-sheaf stilbites and a contrasting ball of bright green prehnite crystals. This is out material that I acquired from a retired quarry worker in the early 1980's.

The mineralogy of this quarry and its adjoining sister, is very similiar coincidentally to the Prospect Quarries in New Jersey.USA.

Collecting at this now defunct quarry was barred in the early 1970's, the location being best known for the huge prehnite specimens it produced.

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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