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Manjiroite & Cryptomelane

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MNR760194

Manjiroite & Cryptomelane

Rare Mineral

Description Tabs

Description
Locality: 
Prompter Mine, Tombstone, Cochise County, Arizona, United States of America
Class: 
Crystals on Matrix
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.1 × 1.8 × 1.6 cm
Description

Black Manjiroite fibrous crystals in Cryptomelane matrix from the famous deposit in Arizona.

Rare sample.

Mineral Data
What's on the rock

Manjiroite

Formula: 
Na(Mn4+7Mn3+)O16
Strunz: 
4.DK.05a
Hardness: 
7.0
Type Locality: 
Kohare mine, Karumai, Iwate Prefecture, Tohoku Region, Honshu Island, Japan

Cryptomelane

Formula: 
K(Mn4+7Mn3+)O16
Strunz: 
4.DK.05a
Crystal System: 
Tetragonal
Hardness: 
5.0 - 6.5
Type Locality: 
Tombstone, Tombstone District, Tombstone Hills, Cochise Co., Arizona, USA