. The prospector's field-book and guide in the search for and the easy determination of ores and other useful minerals. n, 284of beryl oremerald in,279of diamonds in 273of epidote in, 282of garnet in, 281of lazulite in, 66of opal in, 283ofphenacitein, 280of sapphires in, 277of topaz in 67, 278of tourmaline in, 282 >of turquois in,283, 284Ural Mountains, structure of the, 127Uranium; detection of, 81Useful minerals, various, 231-251 346 INDEX. VABIEGATED copper pyrites,165Vitreous copper, 162Volcanic rocks, 27 WAD, 228Wash, definition of, 38Water courses, prospecting of,for oil, 254, 255test
. The prospector's field-book and guide in the search for and the easy determination of ores and other useful minerals. n, 284of beryl oremerald in,279of diamonds in 273of epidote in, 282of garnet in, 281of lazulite in, 66of opal in, 283ofphenacitein, 280of sapphires in, 277of topaz in 67, 278of tourmaline in, 282 >of turquois in,283, 284Ural Mountains, structure of the, 127Uranium; detection of, 81Useful minerals, various, 231-251 346 INDEX. VABIEGATED copper pyrites,165Vitreous copper, 162Volcanic rocks, 27 WAD, 228Wash, definition of, 38Water courses, prospecting of,for oil, 254, 255test for petroleum, 254weight of, 300Weighing, 96, 97Weight by specific gravity, 297- 299Weights and measures, 295-304 special, 300Wet method of analysis, 79-94Whartonite, 208, 209White jade, 8mica, 245Willemite, 189 Witherite, 235Wolframite, 187Wood opal, 283tin, 182 YELLOW ground, 272quartz, 286Yukon district, derivation of thegold of, 137 ZINC, 188-191and iron, 188-201assay of, 102carbonate, 188detection of, 80geology of, 190, 191indication of, 43mine, Sparta, N, J., sectionof strata near, 190Zincite. 189Zircon, 62. Prospectors Collection Mo. 25. 120 specimens, averaging 2% by 2 inches, arranged in pasteboard trays. Allcompactly held in small cabinet of finest workmanship. Interior of drawersare cherry, exterior handsomely finished in solid quartered oak, metalknobs. The collection is conveniently arranged for reference, each speci-men being labeled and numbered to correspond to the following list. Onlytypical specimens are selected, with a view to furnishing the most character-istic examples for study and comparison. Carriage Free to any A ddress in the Worldreached by Railroad or Steamship. FOOTE MINERAL CO., Highest Jiwards and Medals for Collections of Minerals atNine Great Expositions. 1317 ARCH STREET, PHILADELPHIA, PA. (See next page.) STANDARD COLLECTION OF ORES REQUIRED FOR OSBORNS PROSPECTORS FIELD BOOK AND GUIDE. An i?idisp ens able aid and guide to users of this book
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