...J. A. Kohn; J. E. Comeforo Abstract As a portion of a general research program on the synthesis of asbestiform minerals, x -ray and other data have been obtained on the following chemically analyzed synthetic fluor-amphiboles: richterite, Na(CaNa)Mg 5 (Si 4 O 11 ) 2 F 2 , edenite, NaCa 2 Mg 5 (Si...

...Mark D. Welch; Shuangxi Liu; Jacek Klinowski Abstract We report the compositional systematics of the 29 Si MAS NMR spectra of richterite, (super [A]) (Na,K,Rb) 1 (Na,Ca,Sr) 2 Mg 5 Si 8 O 22 (OH,F) 2 ; pargasite, NaCa 2 Mg 4 AlSi 6 Al 2 O 22 (OH) 2 ; and fluor-edenite, NaCa 2 Mg 5 Si 7 AlO 22 F 2...

... compositions. Configurational entropy of mixing models requires W Ri and W Tr to be reduced if the whole solid solution is stable at the synthesis temperature of 1123 K, but not if richterite-rich compositions are metastable. The similarity between Δ H mix of tremolite-richterite and fluor-tremolite-fluor...

... pattern similar to that of clinopyroxene, but has elevated abundances of Na, K, and Ba, elements typically enriched in plagioclase. The source of the F is uncertain, but may be apatite, which is fluor-apatite in this meteorite. The presence of fluoro-edenite in HaH 193, a meteorite that experienced...

... , P.C. , Hawthorne , F.C. , Raudsepp , M. , and Turnock , A.C. ( 1994 ) A-site disorder in synthetic fluor-edenite, a crystal structure study . Canadian Mineralogist , 32 , 21 – 30 . Brown , I.D. ( 2016 ) The Chemical Bond in Inorganic Chemistry . The Bond Valence Model...

... Mineralogist 45 , 983 – 1055 . Tomita, K., Makino, K., & Yamaguchi, Y. (1994) Fluor-edenite: Its occurrence and crystal chemistry...

... investigations. II. X-ray and other data on synthetic fluor-richterite, -edenite and -boron-edenite. American Mineralogist , 40 , 410 –421. Laitakari, A. ( 1921 ) Über die Petrographie der Kalksteingerstatten von Parainen (Pargas). Bulletin de la Commission Géologique de Finlande , 10 , n. 54. Leake...

.... , Raudsepp , M. , and Turnock , A.C. ( 1994 ) A-site disorder in synthetic fluor-edenite, a crystal structure study . Canadian Mineralogist , 32 , 21 – 30 . Boyd , F.R. ( 1959 ) Hydrothermal investigations of amphiboles . In P.H. Abelson , Ed., Researches in Geochemistry , p...

..., Lepontine Alps, Southern Switzerland . Rendiconti della Società Italiana di Mineralogia e Petrologia 34 , 453 – 470 . Boschmann , K. , Burns , P.C. , Hawthorne , F.C. , Raudsepp , M. , & Turnock , A.C. ( 1994 ) A-site disorder in synthetic fluor-edenite, a crystal...

...-magnesiohastingsite containing fluorine, like phlogopite, fluorapatite and chondrodite, have a X F = F/(F+OH) > 0.79. Amphiboles of the hosting trachyandesite are fluoro-members (fluoro-edenite to fluoro-magnesiohastingsite) as well but they have a more variable Si/Al-ratio as the xenolith-hosted fluoro...

... reported in synthetic fluor-edenite ( Boschmann et al. 1994 ), synthetic fluor-pargasite ( Oberti et al. 1995 ), and natural cannilloite ( Hawthorne et al. 1996 ), in the present case only vacancies provide the charge balance for Ca on A. On crystal-chemical grounds the analysis is therefore suspect...

... in synthetic fluor-edenite, a crystal-structure study. Canadian Mineralogist , 32 , 21 –30. Brown, A.I., Moore, P.B., and Sclar, C.B. ( 1987 ) A manganese-rich metamorphic assemblage in the Grenville marble, Balmat, N.Y. Geological Society of America Abstracts with Programs , 19 , 5 . Deer, W.A...

... and 1.5 GPa in 10 mol% increments. Several chemical exchanges deviating from the glaucophane substitution were identified, namely the “edenite” substitution [A] □ + [IV] Si ↔ [A] Na + [IV] Ga toward F-Ga-nyböite, the [A] □ + [M4] Na + [VI] Ga + [IV] Si ↔ [A] Na + [M4] Mg + [VI] Mg + [IV] Ga exchange...

... Kohn JA , Comeforo JE ( 1955 ) Synthetic asbestos investigations, II: X-ray and other data on synthetic fluor-richterite, -edenite, and -boron edenite . Am Mineral 40 : 410 – 421 Konishi H , Groy TL , Dódony I , Miyawaki R , Matsubara S , Buseck PR...

...: what are the effects on microscopic properties? Contributions to Mineralogy and Petrology , 118 , 297 – 313 . Oberti , R. , Hawthorne , F.C. , and Raudesepp , M. ( 1997 ) The behaviour of Mn in amphiboles: Mn in synthetic fluor-edenite and synthetic fluor-pargasite . European...

...-mail address : antonio.gianfagna@uniroma1.it 12 5 2014 14 10 2014 As-rich fluorapatite crystal-chemistry μ-Raman spectroscopy Mt. Calvario Mt. Etna Fluorapatite crystals have been found in association with fluoro-edenite and fluorophlogopite (Gianfagna & Oberti 2001...

...., fluor-edenite, F-rich tremolite) and Ca-rich pyroxenes ( e.g., diopside) are not common minerals in granitic pegmatites, but are quite common in mafic or peralkaline pegmatites. Calcic pyroxenes like diopside, though unusual, are present in Li- and B-rich and chemically evolved pegmatites, and sodic...

... . Boschmann K. Burns P.C. Hawthorne F.C. Raudsepp M. Turnock A.C. ( 1994 ): A-site disorder in synthetic fluor-edenite, a crystal structure study . Can. Mineral. , 32 , 21 – 30 . Bosenick A. Dove M.T. Geiger C.A. ( 2000 ): Simulation studies on the pyrope-grossular...