Mottramite
Introduction: Mottramite was first discovered near Mottram St. Andrew in England and is a lead-copper vanadate. Its small crystals are usually black, dark olive-green or dark grey and tend to aggregate to form botryoidal masses.
Distribution: The Otavi Mountains and the Tsumeb Mine
Composition: Vanadate
Crystal system: Orthorhombic
Lustre: Vitreous, greasy
Streak: Yellow
Hardness: 3-3.5
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