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Todorokite On Calcite

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GND56813

Todorokite On Calcite

Description Tabs

Description
Locality: 
Medford Quarry, Medford, Carroll County, Maryland, United States of America
Size Range: 
Miniature (4.5-7 cm)
Size: 
6.3 × 2.9 × 2 cm
Description

Small white crystals of calcite on matrix have been coated with a thin layer of todorokite. No damage.

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: 
Formula: 
CaCO3
Strunz: 
5.AB.05
Crystal System: 
Trigonal
Hardness: 
3.0
Streak: 
White
Gondwana Minerals