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Stilbite With Calcite On Basalt

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HAN914057

Stilbite With Calcite On Basalt

Description Tabs

Description
Locality: 
Hafrafell, Skaftafell, Hornafjörður, Eastern Region, Iceland
Class: 
Crystals on Matrix
Size Range: 
Cabinet (10-18 cm)
Size: 
5.4 × 11 × 9 cm
Weight: 
310.00gr
Description

Pearlescent and white  sword-shaped crystals of Stilbite and a cluster of  Calcite crystals  in a vug on a basalt matrix

specimen dated 1974

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

Basalt

Variety Of: 

Igneous Rock

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