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Harmotome Edingtonite & Prehnite

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BSM78580

Harmotome Edingtonite & Prehnite

ex Allan Dean Collection #113

Description Tabs

Description
Locality: 
Loanhead Quarry, Beith, North Ayrshire, Scotland, United Kingdom
Size Range: 
Miniature (4.5-7 cm)
Size: 
5.8 × 4.5 × 1.9 cm
Description

Red basalt matrix with pale green overgrowths of prehnite amongst the crystals of which are well formed twinned harmotome crystals and edingtonite.

Collected by Mike McMullen in 1990.

Mineral Data
What's on the rock

Harmotome

Formula: 
(Ba0.5,Ca0.5,K,Na)5[Al5Si11O32] ·12H2O
Strunz: 
9.GC.10
Crystal System: 
Monoclinic
Hardness: 
4.0 - 5.0
Streak: 
White
Type Locality: 
St Andreasberg, St Andreasberg District, Harz, Lower Saxony, Germany

Edingtonite

Formula: 
Ba[Al2Si3O10]·4H2O
Strunz: 
9.GA.15
Hardness: 
4.0 - 5.0
Type Locality: 
Kilpatrick Hills, Strathclyde (Dunbartonshire), Scotland, UK

Prehnite

Formula: 
Ca2Al2Si3O10(OH)2
Strunz: 
9.DP.20
Hardness: 
6.0 - 6.5
Streak: 
White
Type Locality: 
Karoo dolerites, Cradock, Chris Hani District, Eastern Cape Province, South Africa

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