dall, Prof. Carvill Lewis, and the writer," but have not attracted much attention of late. Mr. C. W. Hall, of Minneapolis, now states, however, that Bohemian garnet (i. e., pyrope) is being found in Elliott County in considerable quantity, though he does not say how far it is of gem quality.
Some pyropes have also been obtained from the similar peridotite dike at Highland street, S}'racuse, N. Y., referred to in the report of this Bureau for 1901. These are noted by Mr. P. A. Schneider, of Syracuse, who has given much study to this remarkable and isolated group of peridotite intrusions.
The fine gem-tourmalines of Haddam Neck, Conn.,* are obtained from an albite quarry at that point, situated a few rods from the east bank of the Connecticut River, and at some elevation above it. The albite occurs here as a great vein, or more probably dike, outcropping with a north and south strike and a nearly vertical dip. There are two points where openings have been made. The main quarry is an excavation about 95 feet in length and 50 feet in width, and has been carried down some 40 feet in snow-white feldspar; the other lies a hundred yards to the southwest, and shows an outcrop of perhaps 130 feet long and 26 feet wide; onhT a few trial openings have been made here; the feldspar in this quarry is very pure, but slightly yellowish. In both places the depth of the dike is unknown. It probably extends downward indefinitely. At the main quarry, the excavation has followed down the west side of the dike, where it meets the gneiss rock of the region, but though extended eastward for 50 feet, the opposite wall has not yet been reached.
The gem-tourmalines occur principally near the eastern border of the dike, in a zone of 2 or 3 feet wide, where the feldspar is largely intermingled with other minerals, chiefly quartz, potash-mica (muscovite), and lithia-mica (lcpidolite), garnets, black tourmalines, and several other species of less value. The colored tourmalines are chiefly green, but many are pink, and even red (rubellite), and various tints are often curioushT and beautifully present in the same crystal. Thej^ frequently penetrate the quartz crystals, and are also in the mica and in the albite, but the finest crystals are those from cavities or pockets, where they have had space to develop independently.
The mine has been worked somewhat irregularly for three or four
oGems and Precious Stones of North America, pp. 31, 32.
6 Mineral Eesources C. S. for 1902, U. S. Geol. Survey, 1904, p. 841. Eighteenth Ann. Kept. U. S. Geo]. Survey, pt. 5 (coat.), 1S97, pp. 1183-1204; Nineteenth Ann. Rept, pt. 6 (cont.), 1898. p. 505; Twentieth Ann. Rept., pt. 6 (cont.), 1899, p. 002, PI. I, Fig. E.