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Cassiterite & Quartz

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WND860697

Cassiterite & Quartz

Classic Locality

Description Tabs

Description
Locality: 
Barroca Grande Mine, São Francisco de Assis, Covilhã, Castelo Branco District, Portugal
Class: 
Combination
Size Range: 
Small cabinet (7-10 cm)
Size: 
8.1 × 7.4 × 4.9 cm
Description

Superbly developed and multifaced crystals of dark brown Cassiterite, accompanied by well defined Quartz crystals from the old and famous Barroca Grande Mine at Panasqueira. By the way, I can not understand this new names of the localities. This mine was since decades a mine of Panasqueira area. This fact is in my opinion very confusing for the collectors. Anyway,- here we have sharp and highly lustrous, transparent crystals of Cassiterite, richly on matrix. Despite a few imperfections, this is in every case an impressive specimen.

Mineral Data
What's on the rock

Cassiterite

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

Quartz

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

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