Min. Also Cornubiate. [f. Cornubian, Cornish, f. Cornubia. Cornwall (see CORNISH) + -ITE.] A hard dark blue laminated rock found in Cornwall with granite.
1878. Lawrence, trans. Cotta’s Rocks Class., 230. Naumann has collected into one class, under the name of ‘Cornubiates,’ several exceptional varieties of gneiss.
1879. Rutley, Study Rocks, xii. 213. Cornubianite (proteolite) is a compact granular-scaly condition of gneiss.
