 | | Journal (article/letter/editorial) | | Huanggang Mine, Inner Mongolia, China T he first part of this column concentrated on the North and South...fluorite specimens, in particular those from the north of England. Writing in 1874 (Jenkinson 1874, p....been used for optical instruments. Twinning in north England fluorites is common and is normally of the...penetration type. Associated minerals include sphalerite, galena, siderite, and quartz. Casts of quartz...northern England, particularly from the Rogerley mine, has made these classic specimens available once |  | | Journal (issue) | | surfacing around the city. Much of the current acti vity is taking place in north Austin and in the adjoining...marine sedimentary rock, and the northern part of the city is no exception. In this area, rock of the upper...hardrock exploration companies are attempting to mine lithium (spodumene) and tantalum (tantalite-microlite)...Capacity over 3 tons • Can trim rocks of va rio us ho ri zonta l s ize Wydar Co. Inc. U.S. Paten! 5.638.805...pyromorphite was all over. both at the H oliday Inn North and on the show fl oor, and as is frequently the |  | Gaines, Richard V., Skinner, H. Catherine W., Foord, Eugene E., Mason, Brian, Rosenzweig, Abraham, King, Vandall T. (1997) Dana's New Mineralogy (8th ed.) Wiley-Interscience. p.1872 | Book (edition) | | Smithsonian Inst., Washington, D.C. Alan Pring: South Australian Museum, Adelaide, SA, Australia. Gunnar...Systematic Classification of Nonsilicate Minerals, Bull. Am. Mus. of Nat. Hist., Vol. 172, 1982, and Supplements)...tritomite-(Y) are end members [Ce+Y] in the tritomite series [AM 51:152(1966)]. Chemical prefixes are also employed...wolframite Quartz Opal, some yellow varieties of sphalerite Nepheline Tale, brucite Sillimanite such terms...Identification of Ore Minerals, 2nd ed., Elsevier-North Holland, New York, 1971. The word “opaque” may also |  | | | | surrounded ce ne white calcite, from!iheBluebell Mine; Riondel, Digitized by the Internet Archive...properties but would best be termed sub-metallic. Sphalerite and cinnabar are examples. Halides: Minerals...Greasy or oily: not shiny, not bright, e.g., sphalerite Pearly or opalescent: a depth to the light reflected...black), p. 116 hematite (red, black), p. 68 sphalerite (brown, yellow), p. 92 goethite (yellow, red)...Precambrian, Shield constitutes the stable core of the North American con- tinent. These ancient rocks vary |
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