Images
Formula: Pb9Sb8S21
Sulphosalt, plagionite group
Crystal System: Monoclinic
Specific gravity: 6.08 measured, 6.15 calculated
Hardness: 2½
Streak: Black
Colour: Steel-grey to black
Common impurities: Ag,Cu,Fe
Environments:
Semseyite occurs in hydrothermal veins formed at moderate temperature
(Webmin, HOM),
associated with sorbyite, jamesonite,
bournonite, zinkenite,
guettardite, jordanite,
diaphorite, sphalerite,
galena, pyrite,
chalcopyrite, tetrahedrite,
bournonite, arsenopyrite and
siderite
(HOM).
At the Van Silver Property, Vancouver Mining Division, British Columbia, Canada, semseyite has been observd in co-deposition
with fizelyite and on calcite. More frequently it appears on
quartz, pyrite and
sphalerite
(MinRec 31.3.227).
At Yaogangxian, Hunan, China, semseyite is associated with freibergite,
bournonite and stannite
(MinRec 42.6.594).
Back to Minerals