.... A hydrothermal origin for these phases through Ca-Mg-Fe-Al metasomatism is evident from their mode of occurrence and textures. The phases studied show wide- spread substitution between Mn 3+ and Al in the Y -site and between Mn 2+ and Mg in the X -site. An Mg equivalent of okhotskite, reported for the first time...

..., JAMS President JOURNAL OF MINERALOGICAL AND PETROLOGICAL SCIENCES Vol. 115, No. 6, December 2020 Original Articles A new occurrence of okhotskite in the Kurosegawa belt, Kyushu, Japan: the okhotskite + Mn lawsonite assemblage as a potential high pressure indicator Wataru YABUTA and Takao HIRAJIMA...

... cations, and Z is a tetrahedral site mostly containing Si ( Passaglia and Gottardi 1973 ). End-members of the pumpellyite-type mineral group are julgoldite ( Moore 1971 ; Allmann and Donnay 1973 ), shuiskite ( Ivanov et al. 1981 ), okhotskite ( Togari and Akasaka 1987 ; Akasaka et al. 1997 ), and V...

... Ritsuro Miyawaki, JAMS President JOURNAL OF MINERALOGICAL AND PETROLOGICAL SCIENCES Vol. 115, No. 6, December 2020 Original Articles A new occurrence of okhotskite in the Kurosegawa belt, Kyushu, Japan: the okhotskite + Mn lawsonite assemblage as a potential high pressure indicator Wataru YABUTA...

... of the pumpellyite-group mineral is determined based on the most dominant trivalent cation in the Y site (Passaglia and Gottardi, 1973 ): pumpellyite (with Al Y ) (Palache and Vassar, 1925 ), julgoldite (with Fe 3+ Y ) (Moore, 1971 ), shuiskite (with Cr Y ) (Ivanov et al. , 1981 ), okhotskite (with Mn...

... (rootname) and X (suffix-modifier) sites. Minerals with predominant Al at the Y site have the root-name pumpellyite first proposed by Palache & Vassar (1925) , Fe 3+ – julgoldite ( Moore, 1971 ), Cr 3+ – shuiskite ( Ivanov et al ., 1981 ), Mn 3+ – okhotskite ( Togari & Akasaka, 1987...

... to silicate mineralogy . J. Mineral. Soc. Jpn . , 21 , 3 – 20 . (in Japanese with English abstract). Akasaka , M. , Kumura , Y. , Omori , Y. , Sakakibara , M. , Shinno , I. , Togari , K. ( 1997 ): 57 Fe Mössbauer study of pumpellyite-okhotskite-julgoldite series...

...: pumpellyite ( M 2 = Al), julgoldite ( M 2 = Fe 3+ ), shuiskite ( M 2 = Cr); okhotskite ( M 2 = Mn 3+ ), poppiite ( M 2 = V 3+ ). The valid species are as follows: pumpellyite-(Mg), pumpellyite-(Fe 2+ ), pumpellyite-(Fe 3+ ), pumpellyite-(Mn 2+ ), pumpellyite-(Al), julgoldite-(Fe 2+ ), julgoldite-(Fe 3...

... of pumpellyite-okhotskite-julgoldite series minerals. Mineralogy and Petrology , 61 , 181 –198. Allmann, R. and Donnay, G. ( 1971 ) Structural relations between pumpellyite and ardennite. Acta Crystallographica , B27 , 1871 –1875. ——— ( 1973 ) Crystal structure of julgoldite. Mineralogical Magazine...

... felsic magma interactions. p.97. M.AKAsAKA: Fe-57 mossbauer study of pumpellyite-okhotskite-ju]goldite series minerals. p.181. F.CASTORINA and P.CENSJ: Carbonatites from eastern Paraguay and genetic relationships with potassic magmatism: C, 0, Sr and Nd isotopes. p.237. National Geographic Vo1.193, No.2...

... PUMPELLYITE The differential thermal analysis revealed weak and strong endothermic peaks at 725 and 807°C, respectively, and one exothermic peak at 969°C. These peaks are similar to those reported for okhotskite ( Akasaka et al. 1997 ). The endothermic peaks are due to release of OH from the chromian...

.... Although little is known about the compositional variations in natural crystals, macfallite is compositionally similar to okhotskite (Mn 3+ -analog of pumpellyite) of composition Ca 8 (Mn 2+ ,Mg) 4 (Mn 3+ ,Al,Fe 3+ ) 8 Si 12 O 56–n (OH) n ( Togari and Akasaka 1987 ). A polysomatic description for iso...

... 3+ , Mn 3+ , and V 3+ at the Y site have been named pumpellyite ( Palache and Vassar 1925 ), julgoldite ( Moore 1971 ), shuiskite ( Ivanov et al. 1981 ), okhotskite ( Togari and Akasaka 1987 ), and poppiite ( Brigatti et al. 2006 ), respectively. Fe-rich pumpellyites are common in nature...

... areas of Japan piemontite occurs in a variety of lithologies and records diverse physicochemical conditions. In veins from the manganiferous iron ore deposits of the Tokoro Belt, Hokkaido, Sr rich piemontite coexists with Mn bearing pumpellyite and/or okhotskite, hematite, and bixbyite ( Togari et al...

..., California okhotskite (Ca 1.91 Na 0.04 ) Σ1.95 (Mn 0.69 Mg 0.28 ) Σ0.97 (Mn 3+ 1.13 Al 0.47 Fe 3+ 0.40 Ti0.005)Si3.03 O 9.93 (OH) 4.07 (Ca 1.95 Na 0.05 ) Σ2.0 (Mn 0.71 Mg 0.29 ) Σ1.0 (Mn 3+ 1.13 Al 0.47 Fe 3+ 0.40 Ti0.005)Si 3 O9.93 (OH) 4.07 Togari and Akasaka (1987) Kokuriki mine...

... New formula: V 3+ 8 Fe 3+ 2 O 14 (OH) 2 Okhotskite Current formula: Ca 2 (Mn,Mg)(Mn 3+ ,Al,Fe 3+ ) 2 (Si 2 O 7 )(SiO 4 )(OH) 2 ·H 2 O New formula: Ca 2 Mn 2+ Mn 3+ 2 (Si 2 O 7 )(SiO 4 )(OH) 2 ·H 2 O Poppiite Current formula: Ca 2 (V 3+ ,Fe 3+ ,Mg)V 3+ 2 (Si,Al) 3 (O...

... 2+ ) 10 O 14 (OH) 2 New formula: V 8 3 + Fe 2 3 + O 14 (OH) 2 Okhotskite Current formula: Ca 2 (Mn,Mg)(Mn 3+ ,Al,Fe 3+ ) 2 (Si 2 O 7 )(SiO 4 )(OH) 2 ·H 2 O New formula: Ca 2 Mn 2+ Mn 3 3 + (Si 2 O 7 )(SiO 4 )(OH) 2 ·H 2 O...

... . This implies that Mn 3+ substituting for Al at Y in Mn 3+ -rich pumpellyite, i.e . okhotskite, leads to an increased volume of the [ Y O 6 ] octahedra simultaneously shortening the distance across the narrow channels. Thus, depending on chemistry the assignment of OH-specific IR bands in pumpellyite may...

... and Ag-sulphosalts in a zoned ore deposit, Julcani, Peru —R.O. Sack and P.C. Goodell 1043 Special Issue on minerals of the Deccan Traps, India— Berthold Ottens Hydrothermal synthesis of pumpellyite-okhotskite series minerals —M. Akasaka, Y. Suzuki, and H. Watanabe 25...

... content of piemontite formed by hydrothermal synthesis . Journal of Mineralogical and Petrological Sciences , 95 , 84 – 94 . Akasaka , M. , Suzuki , Y. , and Watanabe , H. ( 2003 ) Hydrothermal synthesis of pumpellyite-okhotskite series minerals . Mineralogy and Petrology , 77...