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Fluorite & Ankerite

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LCM36493

Fluorite & Ankerite

Fluorescent

Description Tabs

Description
Locality: 
Greenlaws Mine, Daddry Shield, Weardale, County Durham, United Kingdom
Size Range: 
Small cabinet (7-10 cm)
Size: 
8 × 4 × 2 cm
Largest Crystal: 
0.70cm
Description

A prominent interpenetrant purple twinned fluorite crystal sitting alongside a bed of ankerite. The back of the piece is covered in small fluorite crystals.

The fluorite on this piece is highly fluorescent. Recovered from lead workings dated from the 1860's.

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
Lakeland Crystals and Minerals