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Gartrellite
Formula: Pb(Cu,Fe3+,Zn)2(AsO4,SO4)2 · 2(H2O,OH)
System: Triclinic
Colour: Greenish yellow
Lustre: Earthy
Hardness: 4½



Strengite
Formula: FePO4 · 2H2O
System: Orthorhombic
Colour: Purple, violet, pink, ...
Hardness: 3½ - 4

From: Tsumeb Mine, Tsumeb, Oshikoto Region, Namibia


Credit: Christian Rewitzer FMF

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