Base metal-tin association. Nigadoo River, New Brunswick, Canada

Major Minerals:

Pyrrhotite, pyrite, sphalerite, arsenopyrite, galena

Minor Minerals:

Stannite group minerals, marcasite, chalcopyrite, cassiterite, argentite, tetrahedrite

Trace Minerals:

Include rutile, dyscrasite, pyrargyrite, native bismuth, native antimony, boulangerite, jamesonite, mackinawite, bournonite


Prismatic and acicular cassiterite is unzoned and untwinned. Euhedral arsenopyrite is replaced by pyrrhotite, chalcopyrite, galena and sphalerite. Chalcopyrite encloses mackinawite and exsolved sphalerite stars. Sphalerite has a number of generations and encloses stannite and tetrahedrite inclusions and has suffered from chalcopyrite disease. It is rimmed by stannite group minerals, especially at sphalerite-chalcopyrite junctions. Galena encloses native bismuth and silver sulphosalt inclusions. Pyrrhotite is extensively altered to Pyrite and marcasite giving bird's-eye textures and lath-shaped intergrowths parallel to (0001) planes of pyrrhotite


Suensilpong and Stumpfl, 1971