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Show APPENDIX NN. 1297 No. 225. Trachyte, from Rosita, Colo., composed chiefly of plagioclase and a little aanidine. A few grains of angite aud magnetite also occur. No. 227. Trachyte, from Taos Range, N. Mex., consisting of sanidine and plagioclase, with streaks of angite aud a few specks of magnetite. No. 229. Trachydolerite, from head of Moreuo Valley, N. Mex., including crystals of augite, plagioclase, and irregularly- detiued crystals of mica, as well as black specks of magnetite. No. 21) 3. Dolerite, from San Luis Valley, Colo., containing augite and many crystals of plagioclase. No. 237. Dolerite, from near Gardner, Colo., consisting of large crystals of angite, plagioclase, and specks of magnetite. No. 239. Dolerite, from Cerro Blanco, Colo., containing plagioclase and augite. No. 242. Domire, from Langhlin's Peak, N. Mex., consisting chiefly of plagioclase and a few crystals of augite. No. 251. Andesite, from East Spanish Peak, Colo., containing plagioclase, a few crystals of pyroxene, specks of magnetite, and dark colored mica. No. 255. Dolerite, from Comanche Creek, New Mexico, composed of plagioclase, augite, and a few particles of oliviue. No. 258. Dolerite, from Costilla Peak, N. Mex., containing crystals of augite, plagioclase, and specks of magnetite. No. 259. Dolerite, from East Spanish Peak, N. Mex., consisting of augite and plagioclase. No. 260. Dolerite, from head of Indian Creek, Colorado, composed of grains and crystals of plagioclase and augite. No. 261. Dolerite, from South Fork of Cucharas River, Colorado, containing angite, plagioclase, and a green mineral, which is probably olivine. No. 264. Syenite, from Taos Range, N. Mex., consisting of quartz, crystals of hornblende, plagioclase, and opaque particles that are probably magnetite. No. 267. Dolerite, from Moreno Valley, N. Mex., containing angite, plagioclase, and specks of magnetite. Pyrite occurs abundantly as an accessory. No. 268. Quartz, porphyry from ridge of Golconda mine, N. Mex., consisting of plagioclase and quartz. No. 269. Dolerite, from San Antonio Canon. N. Mex., containing many microliths of plagioclase, grains of augite, and specks of magnetite. No. 271. Granite from head of Purgatoire River, Colorado, composed of quartz, oligo-clase, and a few crystals of mica, and small particles of an opaque mineral that is probably magnetite. No. 275. Granite, from Taos Range, N. Mex., containing quartz, orthoclase, mica, and a few grains of hornblende. No. 288. Rhyolite, from ridge east of Costilla Peak, N. Mex., consisting of plagioclase, some quartz, and crystals of magnetite. No. 291. Andesite, from Cerro Blanco, Colo., composed chiefly of plagioclase, a few crystals of augite, and many particles of magnetite. No. 292. Andesite, from Taos Range, N. Mex., containing a few crystals of augite, plagioclase, specks of magnetite, and a little mica. No. 293. Dolerite, from Colorado CaHon, N. Mex., consisting of plagioclase, many crystals of augite, and some olivine. No. 294. Dolerite, from Elizabeth Baldy, N. Mex., containing grains of angite, plagioclase, and magnetite. No. 295. Dolerite, from top of Costilla Peak, N. Mex., composed of plagioclase, augite, oliviue, and crystals of magnetite. No. 298. Diorite, from Costilla Peak, N. Mex., consisting of crystals of hornblende plagioclase, much olivine, and specks of magnetite. No. 299. Diorite, from Walsenburg, Colo., containing plagioclase„ hornblende, and some disseminated mica. , No. 301. Andesite, from Uraca Creek, Now Mexico, composed of plagioclase, crystals of augite, and specks of magnetite. No. 302. Basalt, from tower near head of Cncharas River, Colorado, consisting of nepheline, crystals of angite, and particles of magnetite. No. 345. Diorite, from a point just west of Laughlin's Peak, N. Mex., containing plagioclase, hornblende, 6ome olivine, aud magnetite. No. 384. Dolerite, from Uraca Creek, New Mexico, comprising augite, plagioclase, and many specks of magnetite. No. 385. Dolerite, from Rio Grande, New Mexico, containing augite and crystals of plagioclase. No. 386. Dolerite, from head of Cucharas River, Colorado, made up of crystals of plagioclase, augite, and specks of magaetite. No. 388. Dolerite, from mesa northeast of Fort Garland, Colo., composed of many fine crystals of plagioclase, and well- defined crystals of augite. This rock resembles closely No. 233. They are not more than 10 miles apart. 82 £ |