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Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: CHAPTER IV. The Igneous Rocks, Continued. The Dacites, The Andesites And The Rocks Of The Basalt Group. The Dacites And Andesites. Sp. Gr. The Dacites. SiO-A1,0, Fe202FeOCaOMgONa2OK.,0 Loss.1.69.96i5-792.50. .1.730.643-804.121.532.69.3616.230.881.533-l7 1-344.063.O20.453-67.491 6.181.31.222.681-344.372.402.694-67.217.03-51.24.5i-53-71.60.95-67.0316.27. .3-973-421.192.713-51.566.66.03i4.572-571.193-381.893-7 i2.702.077. 63-36 16.35 2-12 3-5 4.79 3-z8 3-58 2-92 0.99 The Andesites. 8. 67.83 15.02 . . 5.16 3-07 0.29 2.40 3-20 1.11 9. 65.50 14.94 1.72 2.27 2.33 2.97 5.46 2.76 1.37 10. 63-49 18.40 2.44 1.09 2.30 .66 5.70 4.62 1.04 11. 62.94 I8.I4 - - 3-82 6.28 3-06 3-83 1.22 O.60 12.61.6216.86 6.616.572.073-931.66 3-61.58i6.34. .6.425-i32.852.693-650.64i+59.48i6.373-213-i74.883-293-32.812.O2S- 56.191 6.124.924.436.994.602.962-371.0316.56.9118.184.653-617.113-494.021.610.36I. McClelland Peak, near Comslock Lode, Nev., F. A. Gooch., Bull. 17, U. S. G. S., 33- 2. Lassen's Peak, California, Hague and Iddings, A. J. S., Sept., 1883, 232. 3- Sepulchre Mountain, Yellowstone Park, J. P. Iddings, Phil. Soc. Wash., XL, 210. 4. Nagy-Sebes, Hungary, Doelter Tscher. Min. Petr. Mitt., 1873, 93- 5. Eureka Dist., Nev. A. Hague Mono., XX., U. S. G. S., 264. 6-7. Colombia, S. America. From Kuch's Petrographie of Colombian Volcanoes, quoted in Jour. Geol., L, 171. 8. Hb.-mica-andesite, Eureka Dist., Nev., Mono., XX., U. S. G. S., 264. 9. Hb.-mica- andesite, Sepulchre Mountain, Yellowstone Park, J. P. Iddings, Phil. Soc. Wash., XL, 210. Compare No. 3- 10. Mica-andesite, Rosita Hills, Colo., W. Cross, Colo. Sci. Soc., 1887, 250. II. Lassen's Peak, Calif., Hague and Iddings, A. J. S., Sept., 1883, 225. 12. Mt . Rainier. See last reference. 13- Pyroxene-andesite, Eure.