Mineralpedia Details for 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
- WebMineral
- View Mottramite
- Mindat
- View Mottramite
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.
(last four photos) A fabulous cabinet specimen with arborescent or plumose Descloizite coated with green Mottramite. Everywhere you look on this specimen is a treat to your eyes. All the crystals are excellent and unique.
Mottramite from Tombstone dist., Cochise Co., Arizona, United States
Olive-green Mottramite that is totally covered in a sugary coating of drusy Quartz.
Mottramite from Mapimi dist., Durango, Mexico
Soft velvety daark green growths of Mottramite. 6cm overall, botryoids to 1cm.
