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Stilbite & Calcite

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SER174201

Stilbite & Calcite

Description Tabs

Description
Locality: 
Grootberg Mountain, Khorixas, Kunene Region, Namibia
Size Range: 
Cabinet (10-18 cm)
Size: 
12 × 8 × 9 cm
Largest Crystal: 
5.10cm
Description

A fantastic, double terminated stilbite crystal on calcite

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
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