... solution between potassic-obertiite and potassic-fluoro-magnesio-arfvedsonite. Zoning toward the rims increases the potassic-fluoro-magnesio-arfvedsonite component up to K Na 2 (Mg 3.5 Fe 3+ 1.5 ) Si 8 O 22 (F 1 (OH) 0.5 O 0.5 ). Table 1. Representative EMP analyses in wt. % oxides and unit formulae...

...-magnesio-arfvedsonite, while composition A is a Fe 2+ , Fe 3+ and C Na rich variety of potassic-obertiite. Composition B is characterized by an exceptional high value of C □. It is emphasized that the presence of C □ and C Na in amphibole needs to be confirmed by other methods. The relationship between W O...

.... Associated minerals are potassic feldspar, alpha quartz paramorphic after beta quartz, eifelite (the second occurrence after the Caspar quarry at Bellerberg volcano, Eifel region), tridymite, rutile, roedderite and other amphiboles. The ideal formula of ferri-obertiite is A Na B Na 2 C (Mg 3 Fe 3+ Ti) T Si 8...

... © 2010 E. Schweizerbart’sche Verlagsbuchhandlung, D-70176 Stuttgart 2010 Solid solution between potassic-obertiite and potassic-fluoro-magnesio-arfvedsonite in a silica-rich lamproite from northeastern Mozambique by Peter ROBINSON*, Arne SOLLI, Ane ENGVIK, Muriel ERAMBERT, Bernard BINGEN...

...), A K B Na 2 C (Mg 3 Fe 3+ Ti) T Si 8 O 22 W O 2 (to be named “potassic-obertiite” according to the present classification scheme) and A K B Na 2 C (Mg 2 \batchmode \documentclass[fleqn,10pt,legalpaper]{article} \usepackage{amssymb} \usepackage{amsfonts} \usepackage{amsmath} \pagestyle{empty...

...Roberta Oberti; Massimo Boiocchi; Frank C. Hawthorne; Giancarlo Della Ventura; Gunnar Färber Abstract Potassic-jeanlouisite, ideally K(NaCa)(Mg 4 Ti)Si 8 O 22 O 2 , is the first characterised species of oxo amphibole related to the sodium–calcium group, and derives from potassic richterite via...

... (Mg,Fe,Mn,Li) amphiboles (see Leake et al. 2003 and Hawthorne and Oberti 2007b for more detail on the classification procedure to be used for these compositions). Other significant findings in the latest few years are the recognition of other anhydrous sodic amphiboles, such as obertiite...

... geological description of the Tanohata Mine was reported by Nambu et al. ( 1969b ). Tanohata Mine is the type locality for mangano-ferri-eckermannite (first described as ‘kôzulite’ by Nambu et al. , 1969a : see Discussion section), natronambulite (Matsubara et al. , 1985 ), potassic-ferri-leakeite...

...) specified in which order prefixes (when more than one is used) must be attached to the root-name. Their sequence is proto-parvo (magno)-fluoro (chloro)-potassic (sodic)-ferri (alumino, mangani)-ferro(mangano, magnesio). In addition, the first prefix attached to the root name does not involve a hyphen (e.g...

... Magnesiokatophorite Nybøite Protomangano-ferro-anthophyllite Fluoro-magnesiohastingsite Magnesiotaramite Obertiite Sodicanthophyllite Fluoropargasite Parvowinchite Potassicarfvedsonite Sodic-ferri-clinoferroholmquistite Fluoro-potassichastingsite Potassic-fluororichterite Potassicleakeite...

... Rothenberg, Eifel volcanic complex, Germany. Ferri-obertiite was found in vesicles in silicate veins within a scoria of a basalt quarry at Rothenberg volcano. Associated minerals include potassic feldspar, α-quartz paramorphic after β-quartz, eifelite, tridymite, rutile, roedderite, and other amphiboles...

..., the analyses reported by Hall ( 1982 ) and Hogarth ( 1997 ) probably referred to compositions towards the possible new end-member ‘potassic obertiite’. In this paper we present a detailed characterisation of potassic-magnesio-arfvedsonite from the Buhovo–Seslavtsi pluton, Bulgaria. The background...

... amphiboles. They usually occur as the Fe 2,3+ - or Mn 2,3+ -dominant species, and may refer either to Ti-dominant root-names, namely mangani- and ferro-ferri-obertiite, (ideally A Na B Na 2 C (Mg 3 Mn 3+ Ti 4+ ) T Si 8 O 22 W O 2 and A Na B Na 2 C (Fe 2+ 3 Fe 3+ Ti 4+ ) T Si 8 O 22 W O 2...

...Frank C. Hawthorne; George E. Harlow Abstract The crystal structures of magnesiosadanagaite (MS) from Mogok, Myanmar, monoclinic, a 9.857(2), b 17.899(4), c 5.318(1) Å, β 105.36(1)°, V 904.74(8) Å 3 , C 2/ m , Z = 2, and potassic-ferrisadanagaite (FS) from the Ilmen alkaline massif, South Urals...

...), whereas there is no apparent limit to homovalent substitution at the various groups of sites (which may give rise to use of the prefixes potassic, ferro-, ferri-, fluoro and even oxo- (related to the rootnames ungarettiite and dellaventuraite; Hawthorne et al. , 2012 ). Systematic work on B,C Li...

... with situation (2): root names plus indicators of homovalent variants. We prefer word prefixes to element suffixes on two counts. Firstly, one must consider ease of use of multiple prefixes; at least for us, the meaning of potassic-ferro-ferri-fluor-horn-blende is much more transparent than “hornblende-(K)–(Fe 2...