Images
Formula: Cu5Zn(AsO4)2(OH)6.H2O
Hydrated arsenate of copper and
zinc, end member of the
goldhillite-philipsburgite-kipushite
series
Crystal System: Monoclinic
Specific gravity: 4.199 calculated
Hardness: 3½
Colour: Bright emerald-green
Environments
Goldhillite was approved as a new mineral in 2021, but some earlier specimens labelled as
philipsburgite may in fact be goldhillite.
Localities
At the Carisa Mine, Mammoth, Tintic Mining District, Juab County, Utah, USA, goldhillite was originally
identified as philipsburgite. The goldhillite occurred as
green spheres composed of platy crystals on a single boulder, in a very heavily oxidised matrix composed mostly of
brown goethite. The size of the individual spheres is about a millimetre
or two, with good coverage of the host matrix
(MinRec 55.2.204-205).
Goldhillite from the Carisa Mine - Image
At the type locality, Middle pit, Gold Hill Mine, Gold Hill, Gold Hill Mining District, Tooele County, Utah, USA,
goldhillite occurs on fracture surfaces in a rock comprised mostly of
quartz
with iron hydroxides in association with mixite,
cornwallite and
conichalcite.
Goldhillite forms transparent, bright emerald-green, tabular crystals with vitreous lustre
(MM 86.436-446).
Goldhillite from the Middle Pit - Image
Back to Minerals