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Stilbite & Calcite

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CR24835

Stilbite & Calcite

Description Tabs

Description
Locality: 
Vágar Island, Faroe Islands, Denmark
Size Range: 
Miniature (4.5-7 cm)
Size: 
5.8 × 4.5 × 4.5 cm
Description

Very good stilbite cluster of silky white stilbite crystals up to 38 mm with some yellowish calcite crystals on top.

Beautiful specimen collected in 1984.

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