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Formula: PbCu(VO4)(OH)
Anhydrous vanadate containing hydroxyl,
adelite-descloizite group
Varieties
Duhamelite is a calcium and bismuth bearing variety of mottramite
Properties
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
Environments
Mottramite is a secondary mineral associated with
descloizite in oxidised zones,
especially in sandstone.
Localities
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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