Gartrellite Locality: New Cobar Mine, Cobar , Cobar , Robinson County, New South Wales , Australia ( Locality at mindat.org ) Field of view 4 mm. Collected by Vic Cloete. Specimen and photo Leon Hupperichs. — Photo: Leon Hupperichs · CC BY-SA 3.0
Gartrellite
Gartrellite is an IMA-recognized mineral species in the arsenate class, with the chemical formula PbCuFe³⁺(AsO₄)₂(OH)·H₂O.
It crystallizes in the triclinic crystal system (space group P-1). It is a member of the Helmutwinklerite structural group.
Key properties: Mohs hardness 4.5; Bright yellow streak; Chalky luster; optically biaxial.
IMA symbol Gtl, IMA status: approved, named in 1988.
A rare mineral found in an oxidized mineralized shear zone cutting graywackes and shales (Anticline prospect, Australia); on fine-grained quartz-spessartine rocks (Broken Hill, Australia).
It is found associated with Secondary copper minerals, quartz, clay minerals, iron oxides (Anticline prospect, Australia); hidalgoite–beudantite, quartz, spessartine (Broken Hill.
The mineral was named to honor Blair J. Gartrell (1950–1994), Australian mineral collector of Beverley, Australia, who found the mineral.