Formula: PbCu(VO4)(OH)
Anhydrous vanadate containing hydroxyl, adelite-descloizite group


Duhamelite is a calcium and bismuth bearing variety of mottramite


Crystal System: Orthorhombic
Specific gravity: 5.9 measured, 6.187 calculated
Hardness: 3 to 3½
Streak: Yellowish
Colour: Grass-green, olive-green, yellow-green, siskin-green, blackish brown, nearly black
Solubility: Readily soluble in acids
Common impurities: Zn

Hydrothermal environments

Mottramite is a secondary mineral associated with descloizite in oxidised zones, especially in sandstone.


At Tsumeb, Namibia, mottramite pseudomorphs after cerussite, after calcite, after wulfenite on lead-rich calcite and after copper with calcite have been found (KL p200-203).

Mottramite from Tsumeb - Image

At the type locality, Mottram St Andrew, Cheshire, England, UK, mottramite occurs as an encrustation on sandstone, associated with duftite, later mimetite and pyromorphite and plumbogummite (RES pps 58-60).

Mottramite from Mottram St Andrew - Image

At Arm O'Grain, Caldbeck, Cumbria, England, UK, mottramite has been found on a quartz matrix (AESS).

Mottramite from Arm O'Grain - Image

At Peldar Tor quarry, Springhill, Whitwick, Leicestershire, England, UK, mottramite crystals have been found on a calcite, dolomite and quartz matrix (RES p201).

Mottramite from Springhill - Image

At Pim Hill mine, Harmer Hill, Shropshire, England, UK, mottramite occurs on sandstone (RES p292).

Mottramite from Pim Hill - Image

At Judkins quarry, Nuneaton, Warwickshire, England, UK, mottramite has been found with baryte, coating calcite (RES p324).

Mottramite from Judkins Quarry - Image

At the Total Wreck mine, Cochise county, Arizona, USA, pseudomorphs of mottramite after wulfenite have been found (R&M 94.2.169).

Mottramite from the Total Wreck Mine - Image

At the Kabwe mine, Central Province, Zambia, mottramite has been reported in dolomite, with inclusions of rosasite (R&M 94.2.130).

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