— cobalt and nickel ores of Chatham, A. A. Hayes, xxi, 195.
— cobalt ores, Wöhler, xxxvi, 332.
— colophonite, v, 113.
— columbite, Rose, xlix, 228.
— copper, native of New Jersey, L. C. Beck, xxxvi, 107.
— —, red oxyd, New Jersey, L. C. Beck, xxxvi, 107.
— —, bisilicate, L. C. Beck, xxxvi, 107.
— —, gray sulphuret, N. Jersey, xxxvi, 107.
— coprolites, S. L. Dana, xlviii, 46.
— couzeranite, xvii, 183.