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Stilbite On Apophyllite

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RPL691009

Stilbite On Apophyllite

Classic Locality

Description Tabs

Description
Locality: 
Hvítusteinar Quarry, Skálabøtnur, Skálafjørđur, Eysturoy Island, Faroe Islands, Denmark
Class: 
Crystals on Matrix
Size Range: 
Cabinet (10-18 cm)
Size: 
5.5 × 11.5 × 6 cm
Largest Crystal: 
1.00cm
Weight: 
342.00gr
Description

Dozens of bright colourless and white stilbite crystals have grown over two generations of clear and white apophyllite. The combination sit on a matrix of  grey basalt and pale green celadonite.

A large, clean and fine example.

Previous labels supplied (not photographed)
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

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

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