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Astrophyllite

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MCH945484

Astrophyllite

ex Stockholm Högskole Collection
With Antique Label

Description Tabs

Description
Locality: 
Eikaholmen, Langesundsfjorden, Larvik, Vestfold og Telemark, Norway
Class: 
Crystal Group/Cluster
Size Range: 
Miniature (4.5-7 cm)
Size: 
6.1 × 3.7 × 3.1 cm
Description

This is a specimen consisting of many «packages» of bronze coloured astrophyllite crystals with some analcime. In addition there is a glass tube containing several flakes of astrophyllite probably used for scientific investigations.

The specimen is followed by a label (incl. original box) of Stockholm Högskole from the time when Prof. W.C. Brøgger was building up the mineral collection for this institution with the remark „Bought in 1887“. Later astrophyllite was described by him in detail (Brøgger 1890).

Mineral Data
What's on the rock

Astrophyllite

Formula: 
(K,Na)3(Fe,Mn)7Ti2Si8O24(O,OH)7
Strunz: 
9.DC.05
Crystal System: 
Triclinic
Hardness: 
3.0
Streak: 
Golden
Type Locality: 
Låven (Skådön; Lamö; Lamanskjaer), Langesundsfjorden, Larvik, Vestfold, Norway

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