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Quartz Titanite Baryte & Calcite

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NST688667

Quartz Titanite Baryte & Calcite

Jan Coetzee pocket

Description Tabs

Description
Locality: 
Jan Coetzee Mine, Okiep, Namakwa District, Northern Cape Province, South Africa
Class: 
Crystal Group/Cluster
Size Range: 
Museum (18cm plus)
Size: 
21 × 10 × 6.5 cm
Weight: 
1 020.00gr
Description

A large cluster of Quartz with inclusions of Chlorite and in paragenesis with small, yellow Barytes, Calcites, Pyrite cubes and Titanite. According to mindat this combination makes specimens from the Jan Coetzee pocket easily identifiable.

A citation from mindat about the find of the Jan Coetzee pocket:

"While tunnelling away from the shaft on the 88 m level, in a southerly direction, one of the miners, a Mr Kennedy noticed an area of decomposed rock on the sidewall of the drift. While testing for stability with a crowbar, he broke into a chamber measuring 12 x 12 metres across and some 6 metres high. The floor, walls and roof were covered by thousands of quartz crystals of all sizes. Most of the larger crystals were lying on the floor, partially imbedded in a layer of green chlorite 15 cm thick. Smaller second-generation clusters were coating the sidewalls and most of the crystal fragments."

Mineral Data
What's on the rock

Quartz

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

Titanite

Formula: 
CaTi(SiO4)O
Strunz: 
9.AG.15
Hardness: 
5.0 - 5.5
Streak: 
White
Type Locality: 
Titanite occurrence, Hauzenberg, Lower Bavaria, Bavaria, Germany

Baryte

Formula: 
BaSO4
Strunz: 
7.AD.35
Hardness: 
3.0 - 3.5
Streak: 
White

Calcite

Polymorph of: 
Formula: 
CaCO3
Strunz: 
5.AB.05
Crystal System: 
Trigonal
Hardness: 
3.0
Streak: 
White