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Jacobsite & Calcite

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RAF99905

Jacobsite & Calcite

Rare Mineral

Description Tabs

Description
Locality: 
NChwaning II Mine, Kuruman, Kalahari, Northern Cape Province, South Africa
Size Range: 
Small cabinet (7-10 cm)
Size: 
8 × 4.5 × 2.5 cm
Largest Crystal: 
1.00cm
Description

A very fine specimen of jacobsite & calcite crystals that came out from N'Chwaning II Mine. A very rare mineral. Magnetic..

Weight: 96 gr.

Mineral Data
What's on the rock

Jacobsite

Formula: 
Mn2+Fe3+2O4
Strunz: 
4.BB.05
Crystal System: 
Isometric
Hardness: 
5.5 - 6.5
Type Locality: 
Jakobsberg Mine, Nordmark (Nordmarksberg), Filipstad, Värmland, Sweden

Calcite

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