Zincgartrellite

Zincgartrellite


Composition: Pb(Zn,Fe,Cu)2(AsO4)2(H2O,OH)2
Crystal System : Triclinic
Colours: Yellow, green
Lustre : Vitreous
Hardness (H) : 4.5
Specific Gravity (S.G) : 5.3
Year of Discovery: 1998
IMA Number: 1998-014
IMA Status: Approved
Discovered By: Gerd Tremmel (German mineralogist)
Named for: Composition/relationship (to gartrellite)

Distribution

Extremely rare (?) The level in the mine from which the type material was recovered is not recorded.

Occurrence

  • Supergene

Paragenetic and General Notes

Discovered on specimens purchased in Namibia (by Gerd Tremmel) in the late 1970s. Isostructural with gartrellite, but chemically it is closely related to helmutwinklerite.

Zincgartrellite occurs on chalcocite, with wulfenite and duftite. It forms aggregates to 0.5 mm, comprising tiny tabular yellow-green crystals of <0.1 mm.

Also as encrustations of minute, bright-yellow, tabular crystals (<0.1 mm), associated with zincolivenite and quartz, on silicified, mineralised dolostone.

As with most species in the Tsumcorite Group, analytical verification is necessary for the identification of zincgartrellite.