Moving mountains for you
Switch currency

Current Live Auctions

Current Live Fixed Price Sales

Jacobsite Calcite & Andradite

Views:
Watches:
RAF78531

Jacobsite Calcite & Andradite

Rare Mineral

Description Tabs

Description
Locality: 
NChwaning II Mine, Kuruman, Kalahari, Northern Cape Province, South Africa
Size Range: 
Small cabinet (7-10 cm)
Size: 
9.5 × 6.5 × 6 cm
Description

Jacobsite, calcite and andradite.

A very fine large specimen. Magnetic !! Very rare mineral. And it only came out once over 10 years ago. This specimen sparkles. Very nice. Weight: 548.4grams

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

Andradite

Formula: 
Ca3Fe3+2(SiO4)3
Strunz: 
9.AD.25
Crystal System: 
Isometric
Hardness: 
6.5 - 7.0
Streak: 
White
Type Locality: 
Drammen, Buskerud, Norway