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Fluorite Quartz Brianyoungite & Sphalerite

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PCZ222440

Fluorite Quartz Brianyoungite & Sphalerite

Description Tabs

Description
Locality: 
Rampgill Mine, Nenthead, Cumbria, United Kingdom
Class: 
Single Crystal
Size Range: 
Small cabinet (7-10 cm)
Size: 
7 × 5 × 2.5 cm
Description

A great specimen featuring hollow epimorphs of sparkling quartz after cubic fluorite crystals which have at some point been dissolved out. Scattered over these are black sphalerites with a part coating of rare white brianyoungite and sharp fluorite crystals. The reverse of the specimen is mainly black ankerite.

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

Quartz

Formula: 
SiO2
Strunz: 
4.DA.05
Crystal System: 
Trigonal
Hardness: 
7.0
Streak: 
White

Brianyoungite

Formula: 
Zn3(CO3,SO4)(OH)4
Strunz: 
5.BF.30
Crystal System: 
Orthorhombic or Monoclinic
Hardness: 
2.0 - 2.5
Streak: 
White
Type Locality: 
Brownley Hill Mine (Bloomsberry Horse Level), Nenthead, Alston Moor District, North Pennines, North and Western Region (Cumberland), Cumbria, England, UK

Sphalerite

Formula: 
ZnS
Strunz: 
2.CB.05a
Crystal System: 
Isometric
Hardness: 
3.5 - 4.0
Peter Crozier Minerals