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Heulandite

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Watches:
CR149876

Heulandite

Classic Locality

Description Tabs

Description
Locality: 
Teigarhorn, Berufjord, Djúpavogshreppur, Eastern Region, Iceland
Size Range: 
Cabinet (10-18 cm)
Size: 
14.5 × 7 × 7 cm
Largest Crystal: 
4.50cm
Description

This is truely a fantastic and old heulandite specimen from the famous teigarhorn.

Lustrous white and parcial gemmy heulandite crystals up to 45 mm (!) on matrix.

Much better in person as it is very hard to get realistic pictures from this stunning specimen.

Ex Riksmuseum Stockholm - with original label.

Mineral Data
What's on the rock

Heulandite

Synonym Of: 

Heulandite-Ba

Formula: 
(Ba,Ca,K,Na,Sr)5Al9Si27O72·22H2O
Strunz: 
9.GE.05
Hardness: 
3.5

Heulandite-Ca

Formula: 
(Ca,Na)2-3Al3(Al,Si)2Si13O36·12H2O
Strunz: 
9.GE.05
Hardness: 
3.5 - 4.0

Heulandite-K

Formula: 
(K,Na,Ca)2-3Al3(Al,Si)2Si13O36·12H2O
Strunz: 
9.GE.05
Hardness: 
3.0 - 3.5

Heulandite-Na

Formula: 
(Na,Ca)2-3Al3(Al,Si)2Si13O36·12H2O
Strunz: 
9.GE.05
Hardness: 
3.0 - 3.5

Heulandite-Sr

Formula: 
(Sr,Na,Ca)2-3Al3(Al,Si)2Si13O36·12H2O
Strunz: 
9.GE.05
Hardness: 
3.0 - 3.5
Hardness: 
3 - 3.5
Colour: 
White
Streak: 
White