Location:

Glen Gairn granite. Scotland, Britain

The Glen Gairn intrusive complex occurs within the Caledonian granite batholith of the Eastern Highlands of Scotland. Close to the centre of a biotite granite to biotite diorite sequence lies the Glen Gairn granite which is zoned. The core is zinnwaldite-bearing and is rimmed by mineralized lithian-rich granite. Greisenization is minor and very localized, as is tungsten, molybdenum and tin mineralization.

Major Minerals:

Cassiterite, wolframite, secondary scheelite, molybdenite

Minor Minerals:

Zircon, rutile, sphalerite, chalcopyrite, pyrite

Trace Minerals:

Include columbite, galena, stannite, magnetite, uraninite, cosalite

Textures:

Euhedral cassiterite and wolframite are zoned and twinned. Alteration of wolframite to scheelite is extensive. Sphalerite carries exsolved stannite group minerals and has suffered chalcopyrite disease

Reference:

Tindle et al., 1987