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Pyrolusite

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BSM66639

Pyrolusite

ex Philadelphia Academy of Science #4982

Description Tabs

Description
Locality: 
Caldbeck Fells, Cumbria, United Kingdom
Size Range: 
Miniature (4.5-7 cm)
Size: 
6.4 × 5.6 × 5 cm
Description

Goethite matrix with some stalactitic development hosts radiating sprays of pyrolusite with an attractive satin lustre.

Interestingly incorrectly labelled as crondstedtite.

From the Dr T.B Wilson Collection and probably dates from the early 1850s.

Mineral Data
What's on the rock

Pyrolusite

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

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