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Fluorite & Siderite

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MGR1084515

Fluorite & Siderite

Classic Locality

Description Tabs

Description
Locality: 
Greenlaws Mine, Daddry Shield, Weardale, County Durham, United Kingdom
Class: 
Crystal Group/Cluster
Size Range: 
Miniature (4.5-7 cm)
Size: 
6.7 × 5 × 2.4 cm
Description

The main crystal is 32 mm on edges, the first photo shows the specimen underdaylight - this way it shows the daylight fluoriescence and violet color. The seocnd photo was done with minor backlight, so you can see the yellow internal color. The faces are very glossy, partly covered with dark brown siderite. No significant damages to report, the reverse was extracted from the rock.

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