 | | Journal (article/letter/editorial) | | [University of Connecticut] at 20:42 14 January 2015 South Dakota is perhaps best known for its pegmatites, which...Hills are responsible for the accessibility of South Dakota’s itbundant and diverse mineral locations...secondary phosphate minerals. Although some pegmatite mining for feldspar still continues (Jacobson 1994). the...except for the Homestake mine, which has operated for more than 120 years, most mining in the area peaked in...and fewer chances to obtain any. However, some mining, mineral exploration, and mineral collecting continues |  | | Journal (article/letter/editorial) | | Hills of South Dakota THOMAS J . C A M P B E L L and WILLARD L . ROBERTS Museum of Geology South Dakota...Dakota School of Mines and Technology Rapid City, South Dakota 57701 more comprehensive description of the...occurrences as the Black Hills area of western South Dakota. These occurrences are quite diverse, ranging...of the CusterKeystone area, to the Homestake gold mine in Lead, to golden barite-bearing concretions east...the recently added South Dakota room in the Museum of Geology at the South Dakota School of Mines and |  | | Journal (article/letter/editorial) | | [University of Kent] at 15:29 06 November 2014 Spessartine Marienfluss, Northern Namibia I n a recent...both almandine and the closely related species spessartine have made them a historically important and relatively...of this year’s Tucson Gem and Mineral Show, spessartine has been chosen as this issue’s Connoisseur’s...a fine spessartine specimen from Marienfluss, northern Namibia, has been chosen. Spessartine, because...yellow, orange, and red; almost pure end-member spessartine is bright orange. It is typically transparent |  | | Journal (article/letter/editorial) | | pohwatp@si.edu Muscovite Shannon Canyon, Inyo County, California R ocks are made up of minerals. Some...minerals. The members of the amphibole, pyroxene, and mica groups are some of the most common and most important...actors” are pyrite and members of the feldspar and the mica groups, providing aesthetic backgrounds that show...fluorapatites that are collector favorites. The name mica, from the Latin micare meaning “to sparkle,” was...perfect cleavage of phyllosilicates—exemplified by the mica group, of which muscovite is one of the more recognizable |  | | Book | | long (Marty, 2004 ). AFRICA widely in Litchfield County, where good crystals were taken from quartz veins...region (Brunet, I 977b ). NEW YORK Amity, Orange County. At many isolated collected sites between the towns...Mount Malosa, Chilwa alkaline province, Zomba district. "Illite" is the name of a series of incompletely...Litchfield County. Ilmenite masses and crystals from somewhere near Washington, Litchfield County, were described...Lake Road occurrence, Faraday Township, Hastings County. In fall 1994, Dan and Shelley Lambert extracted |  | | Book | | Compounds 7 Figure 4 A sample of fluorite (Elmwood Mine, Tennessee). The transition elements (see Figure...sample of cuprite on native copper from the Ray Mine, Arizona. This is the octahedral habit for cuprite...talc is assigned the value of 1, quartz is 7, and diamond is at the top of the scale with a value of 10....Fluorite (Rosiclare Level, Gov Royalty Ore, Minerva Mine #1, Hardin Co., Illinois) 79 80 Chapter 4 The...are responsible for the layered structure of the mica family of minerals. 110 Chapter 5 Factors that | | | Book | | Compounds 7 Figure 4 A sample of fluorite (Elmwood Mine, Tennessee). The transition elements (see Figure...sample of cuprite on native copper from the Ray Mine, Arizona. This is the octahedral habit for cuprite...talc is assigned the value of 1, quartz is 7, and diamond is at the top of the scale with a value of 10....Fluorite (Rosiclare Level, Gov Royalty Ore, Minerva Mine #1, Hardin Co., Illinois) 79 80 Chapter 4 The...are responsible for the layered structure of the mica family of minerals. 110 Chapter 5 Factors that |
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