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Dogtooth spar with fluorite from the Elmwood Mine in Tennessee. Spar is an old mining or mineralogy term used to refer to crystals that have readily discernible faces. A spar will easily break or cleave into rhomboidal, cubical, or laminated fragments with smooth shiny surfaces.
The mineral is brittle, and breaks with a subconchoidal to uneven fracture. It is quite soft, with a Mohs hardness of 3 + 1 ⁄ 2 , [ 3 ] between calcite and fluorite . The specific gravity of the pure endmember with no calcium substituting for strontium is 3.78, [ 9 ] but most samples contain some calcium, which is lighter than strontium ...
Mineral collectors find a variety of reasons to collect minerals. Many minerals are strikingly beautiful and collected for their aesthetic value. Others collect to learn more about mineralogy, the local mining industry and/or local geology. Some simply enjoy exploring the outdoors and socializing and trading with other mineral collectors.
The Tri-State district of Missouri, Oklahoma and Kansas was the major zinc mining district in the United States, with production of 10.6 million tonnes of zinc from c.1850 through 1967. The Eagle-Picher mine of Cardin, Oklahoma, the largest and longest lived mine, ceased production in 1967. [9]
In June 2011, Richmond Mining LTD, an Australian mining company (RHM:ASX), received a special use permit to develop the Buena Vista Iron Ore Mine in Churchill County, Nevada. The permit includes a 25 miles (40 km) slurry pipeline north to Colado Siding [ 6 ] near Interstate 80 and annual use of up to 1,750 acre-feet (570,000,000 US gal) of water.
Normative mineralogy is an estimate of the mineralogy of the rock. It usually differs from the visually observable mineralogy, at least as much as the types of mineral species, especially amongst the ferromagnesian minerals and feldspars, where it is possible to have many solid solution series of minerals, or minerals with similar Fe and Mg ratios substituting, especially with water (e.g ...
The Mountain Pass Rare Earth Mine and Processing Facility, owned by MP Materials, is an open-pit mine of rare-earth elements on the south flank of the Clark Mountain Range in California, 53 miles (85 km) southwest of Las Vegas, Nevada. In 2020 the mine supplied 15.8% of the world's rare-earth production.
Sphalerite is a sulfide mineral with the chemical formula (Zn, Fe)S. [5] It is the most important ore of zinc.Sphalerite is found in a variety of deposit types, but it is primarily in sedimentary exhalative, Mississippi-Valley type, and volcanogenic massive sulfide deposits.
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