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Formula: Bi6Cu140Fe30S125
Valence (Mindat):
Bi6Cu+138Cu2+2Fe3+30S125
Sulphide of bismuth, copper
and ferric iron
Crystal system: Isometric
Specific gravity: 5.048 calculated
Hardness: 3
Streak: Black
Colour: Dark yellow
Environments
Juxingite is a new mineral, approved in 2024 and to date (September 2026) reported only from the type
locality.
Localities
At the type locality, Jiama Cu-polymetallic deposit, Maizhokunggar County, Lhasa, Tibet, China, juxingite
was discovered in the skarn-type ore as anhedral droplets and veinlets,
pale yellow in colour with a black streak
and metallic lustre, a few micrometers to several tens of micrometers in size, in the matrix of
bismuth-bearing bornite. The
juxingite was formed under medium-high temperature conditions and an intermediate-sulphidation state, and it
is associated with the enrichment of gold
(AM 111.9.1503-1511.
Associated minerals include andradite,
anhydrite, bornite,
calcite, chalcocite,
chalcopyrite,
chlorite group minerals,
covellite, digenite,
diopside, epidote,
fluorite, hornblende,
petzite, pyrite,
quartz,
tetrahedrite subgroup minerals,
tremolite, wittichenite
and wollastonite
(Mindat).
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