A well-known mineral district in the state is in northwestern Ohio (Findlay Arch mineral district) where sometimes-spectacular crystals of calcite, celestite, dolomite, fluorite, and others are present in small to large vugs-or cavities inside rocks-in dolomites of Silurian age. Many of them have crystallized from fluids that flowed through the rocks and deposited minerals in open spaces. Minerals occur in a variety of areas in Ohio in association with sediments or sedimentary rocks. Beautiful and colorful crystals of such minerals as calcite, celestite, pyrite, selenite gypsum, and sphalerite, among others, can be found along with small flakes of gold, colorful flint, and rare meteorites and diamonds. Most people would not think of Ohio as a state that would yield a surprising variety of mineral specimens however, there are many Ohio collectors who have assembled collections of museum-quality specimens. In unusual circumstances, minerals may grow into typical crystal forms that make them desirable to collectors. Minerals are naturally-occurring elements or compounds that are the constituents of igneous, metamorphic, and sedimentary rock. Flint Ridge Flint became Ohio's official gemstone in 1965. The most famous deposit of flint in Ohio is an area in eastern Licking and western Muskingum Counties known as Flint Ridge. In pre-historic times, the flint was used by American Indians for tools including knives and spear points today, the polished stone is valued in jewelry making. Flint is Ohio's official gemstone and Flint Ridge flint is renowned for its color and beauty.
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