—, magnetic, igneous origin indicated by jointed structure, xli, 173.
—, —, connection with trap dikes, E. Emmons, xl, 81.
—, —, at Mount Etna, xxx, 186.
—, —, in New Hampshire, xviii, 130.
—, —, in Vermont, iii, 76; vi, 232.
—, —, in Massachusetts, i, 115, 344; v, 269; vi, 208; vii, 255; viii, 55; ix, 43; x, 13, 18; xxii, 52.
—, —, in Rhode Island, (native magnet) iv, 285; v, 402.
—, —, in Connecticut, v, 41; viii, 259; xxxiii, 155; xlvi, 365,f (distorted crystal.)
—, —, in New York, iv, 48; v, 28; ix, 41, 252; xxv, 350; xl, 81.
—, —, in Pennsylvania, viii, 238; x, 219; xiv, 10, 18.