 | | Report (chapter) | | pseudomorph-bearing garnet – sillimanite gneiss from Skallevikshalsen, Lützow-Holm Complex, East Antarctica: Implications...armalcolite pseudomorph has been identified in garnet–sillimanite gneiss from Skallevikshalsen, located...metamorphic grade in the Lützow-Holm Complex, East Antarctica. It occurs as an Fe–Mg– Ti compositional domain...quartz, orthopyroxene + sillimanite and osumilite + garnet (Harley 2008). However, these assemblages are typically...been reported within porphyroblastic quartz in garnet– orthopyroxene-bearing quartzo-feldspathic gneiss |  | | Book (edition) | | supergroup (Biagioni et al., EJM 25, 85-90, 2013), garnet supergroup (Grew et al., AM 98, 785-811, 2013)...Al;[(OH) 4 IPO;(OH)l(PO4))'4Hi0 (8.D, turquoise group). Triclinic, PT, a,b,c = 7.39, 7.72, ll.34,a,p,y=99°46'...luster vitreous, streak white. Cleav- (8.D, mixite group). Hexagonal, P6/111, a,c = 13.55, age {001} perfect...Czech Rep. Ahrensite Fe2SiO4 (9.A, ringwoodite group). Cubic, FdJm, a= 8.16. d: 2.46(10) - 1.245(8) -...Bi)[CIJ(SO4) 3] (7.B, apatite supergroup, hedyphane group). Hexagonal, P6/m, a,c = 9.63, 6.88, Z = 2. d: 3 |  | | Book (edition) | | Minerals that are listed as belonging to the same group are similarly closely comparable in composition...Mountains,Russia,DANS 142, 181-184(sir.) Aescl1yni1e group 0 Aeschynite-(Nd),(Nd,Ce,Ca,Th)(Ti,Nb)i(O.OH)...Urstad,HitteroIsland,Norway, 61. 178 Aeschy11i1e group D Afghanite,[(Na,K)22Ca10][Si24Al14O9<,](SO.)...2105, EJM9, 21-30 (sir.) Ca11cri11ile-Sodali1e group D Afwillite,Ca,(SiO3OH)1·2H1O, mon.. compareBultfonteinite...Gennany,A1ifSS(2004),17-23,NJMA 181(1), 11-19 (group) Mixile group D Agardlte-(La),(La,Ca)CuiAsO4)i(OHk3Hp |  | | Book (edition) | | to the chemical formula, allegiance to a mineral group, symmetry and crystal structure as well as the strongest...chemical formula, structure (crystal system, space group, and unit cell dimensions), and at least some other...site occupancy. The Sb members of the tennantite group (2.G) will serve as a good example: tetrahedrite...registered in this book (e.g. in the amphibole group). For more detailed information see "Dana's System...changes of administrative divisions in central and eastern Europe during the last 60 years are the reason |  | | Journal (issue) | | orientation of table facets. FIELD REPORTS 72 p. 135 Land of Origins: A Gemological Expedition to Ethiopia...nephrite from Washington • Color-change pyrope garnet • Colombian emerald and Mozambican ruby • Colored...add GST. Discounts are available for renewals, group subscriptions, GIA alumni, and current GIA students...final paper is a field report on Ethiopia, a new land of opportunity for colored gems. The 2016 discovery...expedition. Led by field gemologist Wim Vertriest, the group documented mining and processing, measured social |  | 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) | | Uppsala, Uppsala, Sweden. Herbert Obodda: Short Hills, New Jersey. Renato Pagano: Milan, Italy. Ole V...Mineralogical Record, Tuscon, Arizona. Barry Yampol: Oyster Bay, Long Island, New York. Victor Yount: Warrenton,...Species containing more than one anion or anion group may be assigned to a separate class or may be assigned...specifies the atomic (cation to anion, or to anion group) ratio for the mineral. This and the remaining numbers...appropriate Dana number. When recognized, membership in a group is noted. Occasionally, the phrase “an inadequately |
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