Location: |
Nenthead area, North Pennine Orefield |
Major Minerals: |
Sphalerite, galena, pyrite, marcasite, chalcopyrite |
Minor Minerals: |
Gersdorffite, glaucodot, pyrrhotite |
Trace Minerals: |
Include bismuthinite, argentopentlandite, light rare earth fluorocarbonates, monazite, xenotime |
Textures: |
Tabular monoclinic pyrrhotite is intergrown with pyrite, chalcopyrite and minor sphalerite. Pyrrhotite is altered to pyrite, marcasite and magnetite and has glaucodot and gersdorffite overgrowths. Chalcopyrite carries bismuthinite, pyrrhotite and rare argentopentlandite inclusions. Sphalerite shows extensive colour banding some of which is related to compositional variations. Monazite is intergrown with xenotime within quartz, and LREE fluorocarbonates are common as lath-shaped crystals in quartz. |
References: |
Ixer et al., 1979a; Vaughan and Ixer, 1980; Ixer, 1986; Brown et al., 1987 |