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Fluorite & Ankerite With Galena

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LCM43873

Fluorite & Ankerite With Galena

Description Tabs

Description
Locality: 
Allenheads Mine, Allendale, Northumberland, United Kingdom
Size Range: 
Cabinet (10-18 cm)
Size: 
11.5 × 6 × 2.5 cm
Largest Crystal: 
2.80cm
Description

Well formed pale purple twinned fluorite crystals covered with a partial coating of ankerite with a single galena towards the centre.

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

Ankerite

Formula: 
Ca(Fe2+,Mg)(CO3)2
Strunz: 
5.AB.10
Crystal System: 
Trigonal
Hardness: 
3.5 - 4.0
Streak: 
White
Type Locality: 
Styrian Erzberg, Eisenerz, Styria, Austria

Galena

Formula: 
PbS
Strunz: 
2.CD.10
Crystal System: 
Isometric
Hardness: 
2.5
Colour: 
Lead-grey
Streak: 
Lead-grey
Lakeland Crystals and Minerals