Location: |
Gortdrum, County Tipperary, Ireland |
Major Minerals: |
Bornite, chalcocite, chalcopyrite, Hg-rich tennantite |
Minor Minerals: |
Pyrite, galena, sphalerite, haematite |
Trace Minerals: |
Include arsenopyrite, cobaltite, cinnabar, amalgam, wittichenite, stromeyerite, gortdrumite, uraninite, coffinite, digenite, covelline, native copper |
Textures: |
Cobaltite is euhedral and zoned. Tennantite is replaced by bornite and chalcocite. Bornite and chalcocite form characteristic symplectite-like intergrowths (myrmekitic or graphic intergrowths) which are probably the result of simultaneous precipitation of the two sulphides at low temperatures. Stromeyerite and wittichenite occur as fine-grained inclusions in chalcocite. Uraninite forms collomorphic bands and is replaced by bornite along the banding |
References: |
Steed, 1986; Duane, 1988 |