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Cassiterite Fluorite & Ferberite On Quartz

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CLB528605

Cassiterite Fluorite & Ferberite On Quartz

Classic Locality

Description Tabs

Description
Locality: 
Horni Slavkov, Sokolov, Karlovy Vary Region, Czech Republic
Class: 
Combination
Size Range: 
Small cabinet (7-10 cm)
Size: 
8.8 × 5 × 4 cm
Description

The highlight of this specimen is a glossy, black 1.0 cm twin crystal of cassiterite. It's accompanied by black ferberite and some purple, etched fluorite crystals - all on quartz with several elongated crystals. Rather good, seldom seen combination.

Mineral Data
What's on the rock

Cassiterite

Formula: 
SnO2
Strunz: 
4.DB.05
Crystal System: 
Tetragonal
Hardness: 
6.0 - 7.0

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

Ferberite

Formula: 
FeWO4
Strunz: 
4.DB.30
Crystal System: 
Monoclinic
Hardness: 
4.0 - 4.5
Type Locality: 
Niña Mine, Sierra Almagrera, Cuevas del Almanzora (Cuevas de Vera), Almería, Andalusia, Spain

Quartz

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

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