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Apophyllite With Stilbite

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PCZ561727

Apophyllite With Stilbite

Description Tabs

Description
Locality: 
Pune (Poonah), Maharashtra, India
Class: 
Crystal Group/Cluster
Size Range: 
Small miniature (3-4.5 cm)
Size: 
4 × 4 × 4 cm
Description

Apophyllite and stilbite combinations from India are commonplace but this is the best miniature I have come across for some time. It consists of a 2.7 cm wide stilbite crystal inter-grown with a large (3.5 x 2.4 x 2.0 cm), single, sharp  apophyllite crystal of good colour. Two heavyweight crystals in a small package. Sits nicely for display.

Mineral Data
What's on the rock

Apophyllite

Synonym Of: 

Fluorapophyllite-(K)

Formula: 
KCa4(Si8O20)(F,OH)·8H2O
Strunz: 
9.EA.15
Hardness: 
4.5 - 5.0

Fluorapophyllite-(Na)

Formula: 
NaCa4(Si8O20)F·8H2O
Strunz: 
9.EA.15
Hardness: 
4.0 - 5.0

Hydroxyapophyllite-(K)

Formula: 
KCa4(Si8O20)(OH,F)·8H2O
Strunz: 
9.EA.15
Hardness: 
4.0 - 5.0

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
Peter Crozier Minerals