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Montana Gold and Gems Maps by R.N./M.L. Preston.
A collection of 5 large maps covering the entire state of Montana. These maps show gold and silver prospecting areas, and locations where the following gems and minerals have been found: actinolite, agate, amazonite, amethyst, anthophyllite, apatite, arsenopyrite, azurite, barite, beryl, bronzite, calcite, cassiterite, cerussite, chert, chalcopyrite, chrysocolla, corundum, diopside, enargite, epidote, fluorite, fossils, garnet, hematite, hemimorphite, heulandite, heubnerite, jasper, kyanite, limonite, magnetite, malachite, muscovite, olivine, opal, orthoclase, parisite, petrified wood, psilomelane, pyrite, pyrolusite, pyrrhotite, quartz, rhodochrosite, rhyolite, sapphire, selenite, serpentine, scheelite, schorl, siderite, specularite, sphalerite, spinel, staurolite, stibnite, stilbite, titanite, topaz, vesuvianite, wulfenite, and zeolite.
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