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Laumontite Prehnite & Fluorite

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MCH512577

Laumontite Prehnite & Fluorite

With Antique Label

Description Tabs

Description
Locality: 
Gottes Hülfe in der Not Mine, Overberget, Kongsberg, Viken, Norway
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
5.4 × 3.5 × 1.9 cm
Description

Small, white crystals of laumontite are embedded in grey prehnite. The whole is set on a matrix of purple and green coloured fluorite crystals. The specimen is followed by two old labels and an original box. The one label of Stockholm university says (almost illegible and with faded writing): „gave af Kongsberg Sölvverks direktör“ (gift of the director of the Kongsberg Silver Mines).

Mineral Data
What's on the rock

Laumontite

Formula: 
CaAl2Si4O12·4H2O
Strunz: 
9.GB.10
Hardness: 
3.5 - 4.0
Streak: 
White
Type Locality: 
Huelgoat (Locmaria-Berrien), Finistère, Brittany, France

Prehnite

Formula: 
Ca2Al2Si3O10(OH)2
Strunz: 
9.DP.20
Hardness: 
6.0 - 6.5
Streak: 
White
Type Locality: 
Karoo dolerites, Cradock, Chris Hani District, Eastern Cape Province, South Africa

Fluorite

Formula: 
CaF2
Strunz: 
3.AB.25
Crystal System: 
Isometric
Hardness: 
4.0
Streak: 
White
Type Locality: 
Jáchymov (St Joachimsthal), Jáchymov District (St Joachimsthal), Krušné Hory Mts (Erzgebirge), Karlovy Vary Region, Bohemia (Böhmen; Boehmen), Czech Republic

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