Location:

Clevedon, Somerset, Britain

A baryte vein carrying minor sulphide mineralization cuts Triassic dolomitic conglomerates.

Major Minerals:

Galena, sphalerite, chalcopyrite

Minor Minerals:

Tetrahedrite-tennantite, bornite, pyrite, marcasite

Trace Minerals:

Include enargite, 'idaite', covelline

Textures:

Chalcopyrite and tetrahedrite-tennantite show rhythmical banding about galena crystals. Bornite-chalcopyrite form very fine lamellar intergrowths along (100) planes so forming 'idaite'

Reference:

Ixer, 1986