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Stilbite On Calcite

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CAM155783

Stilbite On Calcite

Ex Klaus Petitjean collection
Classic Locality

Description Tabs

Description
Locality: 
Helgustadir Mine, Reydarfjörđur, Fjarðabyggð, Reydarfjördur, Eastern Region, Iceland
Size Range: 
Miniature (4.5-7 cm)
Size: 
6.6 × 5.3 × 2.8 cm
Description

A rich coverage of yellowish white stilbite crystals up to 1.2 cm on calcite crystals up to 3 cm large.
A very fine specimen from this famous classic Icelandic locality.
Collected in 1975.

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

Calcite

Polymorph of: 
Formula: 
CaCO3
Strunz: 
5.AB.05
Crystal System: 
Trigonal
Hardness: 
3.0
Streak: 
White
Cartils Minerals

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