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Colorado Gold and Gems Maps by R.N./M.L. Preston.
A collection of 5 large maps covering the entire state of Colorado. These maps show gold and silver prospecting areas, and locations where the following gems and minerals have been found: actinolite, agate, amazonite, amethyst, Apache tears, apatite, aquamarine, aragonite, argentite, azurite, barite, beryl, bornite, calcite, cerussite, chabazite, chalcedony, chalcopyrite, chlorargyrite, chrysocolla, chrysoberyl, corundum, covellite, cuprite, enargite, epidote, feldspar, ferberite, fluorite, fossils, garnet, geodes, hematite, heubnerite, jasper, lepidolite, limonite, magnetite, malachite, marcasite, muscovite, natrolite, opal, orthoclase, petrified wood, phenakite, pyrite, quartz, rhodochrosite, rhodonite, sapphire, selenite, scheelite, siderite, smithsonite, sphalerite, spodumene, stephanite, stibnite, sylvanite, thomsonite, topaz, tourmaline, turquoise, and zircon.
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