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Superb Crystals of Gartrellite on Carminite

Superb Crystals of Gartrellite on Carminite. Credit: Christian Rewitzer FMF

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

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