Gemstones and Minerals: How and where to Find ThemProspecting and collecting trips; Tools and how to use them; Rock classes and how to recognize them; How mineral deposits form; Field features of mineral deposits; Collecting practices; Preparation of specimens; Storage and exhibit; Marketing mineral specimens and gemstones. |
Contents
PROSPECTING AND COLLECTING TRIPS | 1 |
TOOLS AND HOW TO USE THEM | 37 |
ROCK CLASSES AND HOW TO RECOGNIZE THEM | 74 |
Copyright | |
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acid agate areas basalt beds beryl calcite California Canada cavities cement chalcedony chalcopyrite chemical clay cleaning collecting collectors College color common concentrated contain copper country rock Courtesy U. S. Geological cracks crystals dark dealers Decomposed diabase dissolved drills dumps dynamite easily erals example exposed feldspar fuse gads garnet gemstones gneisses goethite gold gossan grains granite gravel hammer igneous rocks inches iron kimberlite kind lava layers light limestone limonite luster maps marcasite masses material metallic metamorphic rocks mica mineral deposits mineral specimens openings ordinary outcrops oxidized zones pebbles pegmatite pockets possible present prospecting prospector Public Library pyrite quarries quartz regions removed sand sandstone schist screen sedimentary rocks shale shown in Figure soluble solutions species stick stream sulfides surface thin thundereggs tion tourmaline U. S. Geological Survey University veins vugs walls weathering XX XX XX XXX XXX XXX yellow