Chrisstanleyite
A silver-palladium selenide that crystallizes at low temperature in acidic, saline hydrothermal fluids inside calcite veins.
Intro adapted from Wikipedia (CC BY-SA).
Chrisstanleyite is an IMA-recognized mineral species in the sulfide class, with the chemical formula Ag₂Pd₃Se₄.
It crystallizes in the monoclinic crystal system (space group P2_1/c). It is a member of the Chrisstanleyite structural group.
Key properties: Mohs hardness 5; specific gravity 8.38; Black streak; Metallic luster.
IMA symbol Csl, IMA status: approved, named in 1996.
Found in gold-bearing calcite veins in limestone (Hope’s Nose, England); in a carbonate matrix (Tilkerode, Germany); in malachite nodules (Copper Hills prospect, Australia). In a telethermal selenide vein deposit (El Chire prospect.
It is found associated with Gold, fischesserite, clausthalite, tiemannite, eucairite, verbeekite, umangite, cerussite, bromian chlorargyrite (Hope’s Nose, England); clausthalite.
In honor of Dr. Chris J. Stanley (b. 1954), The Natural History Museum, London, England, for his contributions to ore mineralogy.