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Apophyllite & Stilbite

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PCZ797489

Apophyllite & Stilbite

Classic Locality

Description Tabs

Description
Locality: 
Pune (Poonah), Maharashtra, India
Class: 
Crystals on Matrix
Size Range: 
Museum (18cm plus)
Size: 
23 × 15 × 5 cm
Description

I acquired this piece a number of years ago for my own collection. It is a large, top quality specimen with beautiful intense green, lustrous and transparent apophyllite crystals to 3.5 cm. The terminations to the apophyllite crystals are unusual as some are pyrimidal while others flat. The largest crystal is doubly terminated with the different types at each end. The numerous snow white stilbite sheaves mostly stand proud of the matrix to produce an overall stunning display piece.

Exellent condition. Originally from the Armin Wendland collection.

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