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Groutite

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SER1037272

Groutite

ex Americo Urbinati collection

Description Tabs

Description
Locality: 
Holbrook, Navajo County, Arizona, United States of America
Class: 
Crystal Group/Cluster
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.5 × 3.1 × 0.9 cm
Description

petrified wood matrix hosting black crystals of groutite

Mineral Data
What's on the rock

Groutite

Formula: 
Mn3+O(OH)
Strunz: 
4.FD.10
Hardness: 
3.5 - 4.0
Type Locality: 
Sagamore Mangan No. 2 pit, Ironton, Cuyuna North Range, Crow Wing Co., Minnesota, USA