A 500 metre wide blue and white limestone band, striking 120 degrees and dipping about 60 degrees southwest, lies conformable with hornblende and sillimanite schist. The schists are mineralized in places with disseminated marcasite and pyrite and narrow bands of sillimanite and ilmenite.

Within the schists are narrow-banded streaks of very hard, greyish-black minerals resembling emery (magnetite and corundum). Analysis of the rock gave 30 per cent silica, 35 per cent magnetic iron oxide, 30 per cent alumina, and 1.2 per cent lime (Annual Report 1929). A qualitative analysis of the rock showed sillimanite and ilmenite.