Fluorites are not the only mineral of note from Naica. Excellent crystals of sky blue anhydrite in association with sparkling snow white calcite crusts are also found there. This combination really made an impression on the mineral community as massive dull anhydrite is quite common, but fine world class anhydrite crystals are rare.

Granite and Gabbro: is mined for dimension stone and construction aggregates in various loions within the state. Limestone/Dolomite: is mined for dimension stone and construction aggregates in the southeastern portion of the state. Peat: is used for horticultural products like potting soil and is mined in northern Minnesota.

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Gemstones and Collectible Minerals Magnetite In addition to being useful, many of the minerals discussed above are of interest to collectors, but Alabama is home to a variety of gemstones and other specimenquality minerals that are sought after just for their appearance and characteristics.

Illinois industrial minerals include rocks such as limestone, dolomite, and shale and nonmetallic minerals such as silica sand, clay, and fluorite. Major industrial minerals produced in Illinois today are crushed stone (limestone and dolomite), sand and gravel, clay, silica sand, tripoli (microcrystalline quartz), and peat.

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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. Minerals occur in a variety of areas in Ohio in association with sediments or sedimentary rocks.

Emeralds, rubies, garnets, aquamarines, sapphires, topaz, amethyst, citrine, smoky quartz, rose quartz, moonstone, peridot, and many more varieties of gemstones lure rockhounds and gem collectors from around the world to the Blue Ridge Mountains of .

Flint Ridge Flint became Ohio's official gemstone in 1965. Minerals are naturallyoccurring elements ... minerals in Ohio is given in the book Minerals of Ohio, ...

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NBMG Special Publiion 29, Rocks, Gemstones, Minerals, and Fossils in Nevada, is a useful generalized map of areas to go. A large number of popular books have been written on rock, mineral, and gem collecting and recreational prospecting in Nevada and the west in general.

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