...Mariko Nagashima; Nouri-Said Rahmoun; Evgeny V. Alekseev; Charles A. Geiger; Thomas Armbruster; Masahide Akasaka Abstract The crystal chemistry of macfallite from Keweenaw County, Michigan was studied using electron microprobe, thermogravimetry (TG), differential thermal analysis (DTA), powder...

...Paul B. Moore; Jinchuan Shen; Takaharu Araki Abstract The crystal structures of ruizite, Ca 2 Mn 2 3 + ( OH ) 2 [ Si 4 O 11 ( OH ) 2 ] · 2 H 2 O , monoclinic, a = 9.064, b = 6.171, c = 11.976Å, β = 91.38°, space group C 2/ m , Z = 2, R = 0.084 for 1546 independent F o ; macfallite, Ca 2 Mn 3 3...

...F igure 7. Hydrogen positions and hydrogen bonds in macfallite ( Nagashima et al. 2008 ) projected parallel to [010]. Dashed lines indicate H···O bonds. ...

..., infrared spectra of pumpellyite-(Al) were analyzed by Hatert et al . (2007) . However, details of the hydrogen-bond system in pumpellyite have not yet been investigated. © 2010 E. Schweizerbart’sche Verlagsbuchhandlung, D-70176 Stuttgart 2010 pumpellyite hydrogen macfallite sursassite Jahn...

...-(Fe 3+ ) with the simplified formula Ca 2 Fe 3+ 3 Si 3 O 11 (OH) 3 ( Artioli et al. , 2003 ) has another interesting aspect. The structurally related manganese mineral macfallite has a corresponding stoichiometry Ca 2 Mn 3+ 3 Si 3 O 11 (OH) 3 but a distinct crystal structure ( Nagashima et al...

... uranium minerals (bolt-woodite and zippeite) and the Miyajima et al. contribution on orientite and macfallite (both complex hydrous manganese silicates), which is complete with chemical analyses, cell parameters and even a listing of the X-ray powder diffraction data! The editor, Richard Hagni...

... , N.S. , Alekseev , E.V. , Geiger , C.A. , Armbruster , T. , and Akasaka , M. ( 2008 ) Crystal chemistry of macfallite: Relationships to sursassite and pumpellyite . American Mineralogist , 93 , 1851 – 1857 . Nagashima , M. , Akasaka , M. , Minakawa , T...

... interval up to 10 kbar ( Reinecke, 1986 ). Sursassite is isotypic with macfallite, Ca 2 (Mn,Al) 3 (SiO 4 )(Si 2 O 7 )(OH) 3 ( Moore et al. , 1979 ), is closely related to pumpellyite, Ca 2 Al 3 (SiO 4 )(Si 2 O 7 )(OH) 3 ( Mellini et al. , 1984 ), and shows a crystal structure based on chains of edge...

... ( Table 8 ). The monoclinic ( P 2 1 / m ) minerals macfallite and sursassite have minor related analogies, being related to another polysomatic series. The lavoisierite structure is, in fact, composed of alternating ‘‘ardennite-like'' and ‘‘sursassite-like'' slabs. There is, thus, a polytypic series...

...) Crystal chemistry of the 2 ∞ [M 3+ 2 Φ 2 (TO 4 ) 2 ] sheet: Structural principles and crystal structures of ruizite, macfallite, and orientate . American Mineralogist 70 , 171 – 181 . Shannon, R.D. (1976...

... are dominated by Mn 3+ - and Fe 3+ -rich silicates such as aegirine, piemontite, namansilite, orientite–macfallite and cerchiaraite ( Lucchetti et al. , 1988 ; Basso et al. , 1989a , 1989b , 2000 ; Kampf et al. , 2013 ), at variance with the relatively reducing johannsenite-, rhodonite-bearing...

..., macfallite and orientite . Am. Mineral ., 70 , 171 – 181 . North , A.C.T. , Phillips , D.C. , Scott Matheus , F. ( 1968 ): A semiempirical method of absorption correction . Acta Crystallogr ., A24 , 351 – 359 . Shannon , R.D. ( 1976 ): Revised effective ionic radii...

... refinement program on Windows computer . Journal of the Crystallographic Society of Japan , 45 , 145 – 147 (in Japanese). Nagashima M. Rahmoun N.S. Alekseev E.V. Geiger C.A. Armbruster T. Akasaka M. ( 2008 ) Crystal chemistry of macfallite: Relationships to sursassite...

... ( Passaglia and Gottardi 1973 ). The structures and crystal chemistries of pumpellyite-type minerals are closely related to those of several silicate minerals containing disilicate (e.g., sursassite, macfallite) or trisilicate groups (e.g., ardennite, orientite) and to synthetic Ca-free high-pressure phases...

...: its crystal structure . Science , 159 , 524 – 526 . Moore , P.B. , Shen , J. , Araki , T. ( 1985 ): Crystal chemistry of the 2 ∞ [M 3+ 2 Φ 2 (TO 4 ) 2 ] sheet: structural principles and crystal structures of ruizite, macfallite and orientite . Am. Mineral ., 70 , 171...