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Heulandite

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CR28741

Heulandite

Ex Naturhistoriska Riksmuseet Stockholm
Classic Locality

Description Tabs

Description
Locality: 
Teigarhorn, Berufjord, Djúpavogshreppur, Eastern Region, Iceland
Size Range: 
Small cabinet (7-10 cm)
Size: 
7 × 7 × 6 cm
Largest Crystal: 
2.00cm
Description

Large cluster of sub-parallel heulandite crystals standing up on matrix. The heulandite crystals have excellent pearly luster. No damage.

Very good old specimen from the Naturhistoriska Riksmuseet Stockholm

See article in Min. Rec., Jan.-Feb. 1981: Famous Mineral Localities: Zeolites From Iceland and the Faeroe Islands.

 

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