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Heulandite

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ATM1071558

Heulandite

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Description
Locality: 
Cape Marrargiu, Bosa, Oristano Province, Sardinia, Italy
Class: 
Crystals on Matrix
Size Range: 
Small miniature (3-4.5 cm)
Size: 
1.42 × 3.81 × 2.66 cm
Largest Crystal: 
0.80cm
Description

Heulandite crystals covering matrix surface.

Sharp crystals with good lustre.  No damage.

Crystals to 0.3cm.  Unusual locality.

Ex my personal collection.  L4523

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

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