Chemical Formula: PbCu(VO4)(OH)
Locality: Mottram, St. Andrews, Cheshire, England.
Name Origin: Named for the locality.
Mottramite is an orthorhombic mineral, PbCu(VO4)(OH), at the copper end of the descloizite group. It was formerly called cuprodescloizite or psittacinite (this mineral characterized in 1868 by Frederick Augustus Genth).
Discovery date : 1876
Town of Origin: MOTTRAM, ST. ANDREW’S, CHESHIRE
Country of Origin : ANGLETERRE
Optical and misc. Properties: Transparent to Opaque
Refractive Index: from 2,17 to 2,32
Axial angle 2V : ~73°
Color: Brown, Brown red, Brownish black, Green, Dark green.
Density: 5.9 – 6, Average = 5.95
Diaphaneity: Transparent to Opaque
Fracture: Brittle – Generally displayed by glasses and most non-metallic minerals.
Hardness: 3.5 – Copper Penny
Luster: Greasy (Oily)
Streak: light brownish green