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Pyrolusite With Cryptomelane

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PDM982318

Pyrolusite With Cryptomelane

Description Tabs

Description
Locality: 
Groote Eylandt, Northern Territory, Australia
Class: 
Massive/Crystalline
Size Range: 
Small miniature (3-4.5 cm)
Size: 
4.2 × 2.6 × 1.1 cm
Description

Black pisolitic pyrolusite and cryptomelane cemented by oolitic pirolusite. The piece was cut and polished and the internal concentric structure is perfectly exposed. Probaby from the GEMCO mine, where Cretaceous Oolitic and pisolitic lateritic manganese ores are exploited.

Acquired in the early 1980’s by Ludo Van Goethem. Ex Ludo Van Goethem #375.

Combine specimens to reduce shipping costs!.

Mineral Data
What's on the rock

Pyrolusite

Formula: 
MnO2
Strunz: 
4.DB.05
Hardness: 
2.0 - 6.5

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

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