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Epistilbite & Heulandite

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SMM868339

Epistilbite & Heulandite

Description Tabs

Description
Locality: 
Su Marralzu, Osilo, Sassari Province, Sardinia, Italy
Class: 
Crystals on Matrix
Size Range: 
Small cabinet (7-10 cm)
Size: 
7 × 5 × 4 cm
Weight: 
150.00gr
Description

Beautiful bundles of epistilbite crystals surrounded from pale purple crystals of amethyst and others groups in more point of the sample. There is a honey-yellow group of heulandite crystals. Very nice sample!

Mineral Data
What's on the rock

Epistilbite

Formula: 
CaAl2Si6O16·5H2O
Strunz: 
9.GD.45
Hardness: 
4.0
Streak: 
white
Type Locality: 
Breiðdalur- Berufjörður area, Suður-Múlasýsla, Eastern Region, Iceland

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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