 | | Journal (article/letter/editorial) | | ,OH)12]{[Na]4 [Si]2}{[Mn]3[Mn,Nb,Ti]2}(OH,H2O,Cl)10. Common features of the crystal structure are basically...and Mössbauer spectroscopy for Fe of the F-rich tourmaline gave SiO2 34.38, TiO2 0.17, B2O3 10.12, Al2O3...end-member schorl, in the tourmaline group. The F-rich and Fe-rich tourmaline was found at Grasstein, Sachsenklemme...only the W site in this tourmaline and the presence of F in Fe-rich tourmaline seems to require a signiÞcant...structure. X-site vacancies were low in the F-rich tourmaline, showing the inßuence of the W-site on the neighboring |  | | Report (issue) | | Pegmatite Investigations 1942-45 New England By EUGENE N. CAMERON and OTHERS GEOLOGICAL SURVEY PROFESSIONAL...PRINTING OFFICE, WASHINGTON : 1954 UNITED STATES DEPARTMENT OF THE INTERIOR Douglas McKay, Secretary GEOLOGICAL...______________________________________ _ Location of pegmatite districts ___________________ _ Previous work...Acknowledgments ______________________________ _ History of pegmatite mining inN ew England _______ _ Mica mining _...deposits _______________________ _ Geology of the pegmatite districts of Maine __ :. . _____ _ Metamorphic |  | | Journal (article/letter/editorial) | | the authors of the Geological Survey Memoir (1912, No. 338); laceomorphic internal features were described...biotite-rich schlieren to aplogranite or even pegmatite [compare C]oos's ' Schlierenaplite ', ' Lagenschlieren...(see bibliography, Geological Survey Memoir, 1912, No. 338, pp. 92-4). This paper deals solely with the...space immediately above the SiO2%-line.] Q.J.G.S. No. 350 of Downloaded from http://jgslegacy.lyellcollection...(4), and Ore3Ab6oAnl7 in the alkali-lime pegmatito (10). The porphyritic felspars (analyses 70-78) range |  | | Journal (article/letter/editorial) | | conditions. Green, Brunfelt & Heier (1969, 1972) observed no fractionation in REE when the melamorphic grade changed...rocks, especially not in more basic types (Fig. 3b, No. 46), nor in sediments (Fig. 3e, Nos. 52, 53; Fig...reerystallizes during metamorphism (el. Fig. 3c, No. 6). Common rock-forming minerals in magmatie or..."+"-+T+T+T/ --~;~=,._~--,r..~_.~L.~ U. 1 '%;~ ~ "~-,~ "10,',~ 4 ~m% 260 SO 100 .~.~0 ! 32" c 252 T...Presvecokarelidic rocks, No. 1 (2.6-2.8 Gyr). Svecokarelidic rocks, Nos. 2-6, and 10-13 (1.81.95 Gyr). Rapakivi |
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