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Mineralpedia Details for Mottramite

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Mottramite

Mottramite

Named for an ore stockpile containing the mineral at Mottram St. Andrew in Cheshire, England, although the ore was likely mined nearby at the Pim Hill mine in Shrewsbury. Mattramite is a somewhat common secondary mineral that forms in oxidized vanadium-rich base metal deposits. Additional locations include in the United States, Chile, Namibia, and Zambia among many others.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/mottramite.pdf

Formula
PbCuVO4(OH) 
Crystal System
Orthorhombic 
Crystal Habit
Plumose, Radial, Encrustations 
Cleavage
None, None, None 
Luster
Greasy (Oily) 
Color
brown, brown red, brownish black, green, dark green 
Streak
light brownish green 
Class
Orthorhombic - Dipyramidal 
Fracture
Brittle 
Hardness
3.5 
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Mottramite from Tsumeb mine, Tsumeb, Namibia

Mottramite
            from Tsumeb mine, Tsumeb, Namibia

Grass green arborescent crystals of Mottramite to 8mm with nice luster probably due to a fine coating of Calcite.

Green botryoidal crystals of Mottramite to 4mm with a pleasant velvet-like luster with associated white Calcite crystals.

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Mottramite from Tombstone, Cochise Co., Arizona, United States

Mottramite
            from Tombstone, Cochise Co., Arizona, United States

Olive-green Mottramite that is totally covered in a sugary coating of drusy Quartz.

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Mottramite from Mapimi dist., Durango, Mexico

Mottramite
            from Mapimi dist., Durango, Mexico

Soft velvety daark green growths of Mottramite. 6cm overall, botryoids to 1cm.

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