Alloy of platinum and tin
Specific gravity: 13.4 calculated
Solubility: No reaction with common acids
Common impurities: Pd,Sb,Bi,Te
Niggliite occurs in late-forming hydrothermal veins
At the Sudbury Complex, Sudbury District, Ontario, Canada, niggliite is associated with froodite (HOM).
At the Xiaonanshan Cu-Ni-(Pt-Pd) deposit, Wuchuan county, Hohhot League, Inner Mongolia, China, niggliite is associated with leadamalgam, chromite, ilmenite, magnetite, gersdorffite, pyrite, chalcopyrite, violarite, millerite, galena, stibnite, electrum, sperrylite, iridosmine, platinum, merenskyite and kotulskite (HOM).
At the Monchegorsk Cu-Ni Deposit, Monchegorsk, Murmansk Oblast, Russia, niggliite occurs in close association with stannopalladinite, hessite and tellurides of platinum and palladium (AM 56.360-361).
At the type locality, Waterfall gorge, Insizwa, Alfred Nzo District, Eastern Cape, South Africa, niggliite was found in the concentrates from oxidised ore from the dumps. Associated minerals included sperrylite, chalcopyrite, cubanite, pentlandite, bornite, parkerite, insizwaite and pyrrhotite (AM 23.64, HOM).
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