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Todorokite & Calcite

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SMS1108611

Description Tabs

Description
Locality: 
Smartt Mine, Kalahari, Northern Cape Province, South Africa
Class: 
Crystal Group/Cluster
Size Range: 
Small cabinet (7-10 cm)
Size: 
7.7 × 5.1 × 4 cm
Weight: 
160.63gr
Description

The specimen consists of a free formed pouch of charcoal grey todorokite filled by lustrous clear and milky calcite. The todorokite formed into long asbestiform fibrous free-formed fold. The todorokite has the an almost chatoyant sheen.

Mineral Data
What's on the rock

Todorokite

Formula: 
(Ca,K,Na,Mg,Ba,Mn)(Mn,Mg,Al)6O12·3H2O
Strunz: 
4.DK.10
Hardness: 
1.5
Type Locality: 
Todoroki mine, Yoichi, Shiribeshi Province, Hokkaido, Japan

Calcite

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

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