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Formula: CuPtAsS2
Sulphosalt, platinum- and arsenic-
bearing mineral
Crystal System: Orthorhombic
Specific gravity: 7.57 calculated
Hardness: 3½
Colour: Steel-grey with a yellow tint
Solubility: Not attacked by hydrochloric, nitric or phosphoric acid
Magnetism: Not magnetic
Environments
Plutonic igneous environments
Metamorphic environments
Localities
There are two co-type localities, Sandao village, Fengning County, Chengde, Hebei, China, and the daomanite
locality, Tiema-Habaqin complex, Luanping County, also at Chengde, Hebei, China.
At the type localities daomanite occurs as a replacement of bornite
in contact metasomatic
platinum-bearing
cobalt–copper sulphide mineralisation
in peridotite -
pyroxenite at the contact with
anorthosite or
granite - gneiss.
Associated minerals include bornite,
chalcopyrite, carrollite,
pyrite, tetrahedrite,
galena and molybdenite, and minor
sperrylite, cooperite,
moncheite, cobalt-bearing
malanite, yixunite and
damiaoite
(HOM).
At the Imandra layered complex, Murmansk Oblast, Russia, daomanite is present as rare submicrometric
subhedral grains enclosed by hydrous silicates. Its composition agrees very well with the ideal formula
PtCuAsS2, and is consistent with the existence of a minor substitution of Pt for Cu. This occurrence
of daomanite at Imandra is the only reported locality outside China, where it is proposed that
daomanite could have formed by the replacement of bornite. This
mode of formation is very unlikely for the subhedral daomanite from Imandra
(CM 42.2.455-467).
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