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Gyrolite & Apophyllite

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RPL827310

Gyrolite & Apophyllite

Description Tabs

Description
Locality: 
Ljósá, Eysturoy Island, Faroe Islands, Denmark
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
5.5 × 3.5 × 3.5 cm
Largest Crystal: 
0.80cm
Weight: 
94.00gr
Description

A thin matrix of black basalt with part of a vug lined with thomsonite, a couple of prominent apophyllite, mostly covered by glassy gyrolite also with minor mordenite and chabazite. A particularly clean and bright specimen including gyrolite, one of the rarer zeolites in the Faroes.

Mineral Data
What's on the rock

Gyrolite

Formula: 
NaCa16Si23AlO60(OH)8·14H2O
Strunz: 
9.EE.30
Hardness: 
2.5
Streak: 
White
Type Locality: 
The Storr, Portree, Trotternish, Isle of Skye, North West Highlands (Inverness-shire), Scotland, UK

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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