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Stilbite With Heulandite

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BSM581681

Stilbite With Heulandite

ex Pearl Freeman Collection #610

Description Tabs

Description
Locality: 
Reydarfjördur, Eastern Region, Iceland
Class: 
Crystals on Matrix
Size Range: 
Small cabinet (7-10 cm)
Size: 
8.5 × 9.7 × 4 cm
Description

Large off-white wheatsheaf crystals of stilbite intermixed with some heulandite crystals displaying a bright pearly lustre. This is a relatively old specimen. There is a little bruisng in places but overall quality average to good.

Pearl Freeman acquiring it in 1980. The main pasted label states Stilbite, Iceland. There is an additional blue rimmed oval label with a catalogue number of 443.

Pasted Label
Mineral Data
What's on the rock

Stilbite

Synonym Of: 

Stilbite-Ca

Formula: 
NaCa4[Al9Si27O72]·nH2O
Strunz: 
9.GE.10
Hardness: 
3.5 - 4.0

Stilbite-Na

Formula: 
(Na,Ca,K)6-7[Al8Si28O72]·nH2O
Strunz: 
9.GE.10
Hardness: 
3.5 - 4.0
Hardness: 
3.5 - 4
Colour: 
White
Streak: 
White

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
Provenance

Pearl Freeman Collection

Wed, 2015-07-22 22:52 -- admin
Some History
Dates: 
Post War- 
2011
Type: 
Collector/Collection
Specialisms: 
Baryte, United Kingdom, Peru, Sulphides
About

Pearl and her husband Sid were enthusiastic mineral collectors for several decades; Pearl was also long time treasurer of the British...

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