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Quartz Beryl Mica Cassiterite

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RBR730862

Quartz Beryl Mica Cassiterite

Classic Locality

Description Tabs

Description
Locality: 
Krupka, Krušné Hory, Ústí nad Labem Region, Czech Republic
Class: 
Crystal Group/Cluster
Size Range: 
Miniature (4.5-7 cm)
Size: 
6 × 5 × 4.5 cm
Description

Krupka has produced only a limited number of good quartz specimens. This one is a very nice group of pretty clear crystals developed as a floater. The specimen shows a few other minerals as well: mica, included cassiterite and some small beryl-crystals at the base.

Mineral Data
What's on the rock

Quartz

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

Beryl

Formula: 
Be3Al2(Si6O18)
Strunz: 
9.CJ.05
Crystal System: 
Hexagonal
Hardness: 
7.5 - 8.0
Streak: 
White

Mica

Group Parent: 
Mica Group

Cassiterite

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