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Apophyllite & Stilbite

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MGR1128016

Description Tabs

Description
Locality: 
Jalgoan Quarries, Maharashtra, India
Class: 
Combination
Size Range: 
Cabinet (10-18 cm)
Size: 
14.8 × 8.4 × 5.7 cm
Description

A charming and well-balanced specimen from India, featuring lustrous, sharply terminated apophyllite crystals accompanied by several well-formed orange-pink stilbite blades. The apophyllite shows excellent clarity and surface brilliance, while the stilbite adds a warm contrast and classic zeolite-group aesthetic. This piece originates from one of the most prolific sources of zeolite minerals on Earth – remarkably, these stunning cavities form inside ancient volcanic basalt flows, where hydrothermal fluids deposit crystals over millions of years.

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