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Fluorite On Siderite

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BSM167270

Fluorite On Siderite

Greenlaws Mining Project Team 2014

Description Tabs

Description
Locality: 
Greenlaws Mine, Daddry Shield, Weardale, County Durham, United Kingdom
Size Range: 
Miniature (4.5-7 cm)
Size: 
6.1 × 4 × 2.8 cm
Description

 Dark brown oxidised spherical clusters of siderite crystals forming a central dome on one side of which deep purple and gemmy crystals of fluorite have grown.

This is from an old lead mine which closed in 1897.  This is one of the very first specimens to come from the recent fluorite discovery made by the Greenlaws Mining Project Team which is currently exploring and developing the mine for fluorite specimens.

Mineral Data
What's on the rock

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

Siderite

Formula: 
FeCO3
Strunz: 
5.AB.05
Crystal System: 
Trigonal
Hardness: 
3.5 - 4.5
Streak: 
White

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