Glen Gairn diorite. Scotland, Britain

A biotite and amphibole-bearing diorite surrounds a zinnwaidite granite.

Major Minerals:

Haemoilmenite, sphene, magnetite, pyrite

Minor Minerals:

Pyrrhotite, chalcopyrite, TiO2 minerals

Trace Minerals:

Include pentlandite


Exsolution has occurred between ilmenite-haematite to form haemoilmenite. Sphene forms overgrowths on iron-titanium oxides or as large discrete crystals. Pounded inclusions of pyrrhotite and pyrrhotite-chalcopyrite (due to the breakdown of iss) are present within sphene and amphibole


Tindle et al., 1987