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Heulandite

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Heulandite

Description Tabs

Description
Locality: 
St Gotthard Tunnel, NEAT Construction Site, Amsteg, Uri, Switzerland
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
6.5 × 5.5 × 1.1 cm
Description

From the official yield during the operating period of NEAT in Switzerland. Everybody who knows the circumstances of this great site will agree with me, that such stuff is exceeding hard to come by. Here we have numerous well developed, mirror bright and razor sharp crystals of Heulandite, richly covering the typical matrix. There is one significant "trademark" of most of the specimen from the locality. They look so exceedingly fresh, "like new born"

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
Wendel Minerals

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