Location:

High-temperature tin and tungsten assemblages. Devon and Cornwall, Britain

Major minerals Cassiterite, wolframite, arsenopyrite, lollingite, pyrite, molybdenite, haematite, scheelite, chalcopyrite, stannite group minerals

Major Minerals:

Cassiterite, wolframite, arsenopyrite, lollingite, pyrite, molybdenite, haematite, scheelite, chalcopyrite, stannite group minerals

Minor Minerals:

Pyrrhotite, native bismuth, bismuthinite, bornite, sphalerite

Trace Minerals:

Include native gold, magnetite, ilmenite, chalcocite, covelline

Textures:

Cassiterite is euhedral and twinned and is associated with tabular zoned wolframite. Euhedral arsenopyrite is zoned and twinned and carries pyrrhotite, native bismuth and bismuthinite inclusions. Chalcopyrite carries stannite inclusions. Sphalerite carries pyrrhotite and stannite group mineral inclusions and suffers chalcopyrite disease. Stannite rims around cassiterite and between sphalerite and chalcopyrite are common. Pyrrhotite is altered to pyrite and marcasite and other sulphides to secondary copper minerals

Reference:

Manning, 1983