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Epistilbite & Heulandite

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GMN1082737

Description Tabs

Description
Locality: 
Abrud Mine, Alba County, Romania
Class: 
Crystal Group/Cluster
Size Range: 
Miniature (4.5-7 cm)
Size: 
5.5 × 3.5 × 2.5 cm
Description

Sprays, and single crystals of translucent well formed epistilbite crystals with nice heulandite crystals

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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