...Fig. 2. The Raman spectra of reznitskyite (our data), tilasite and isokite (RRUFF database [Lafuente et al ., 2015 ], R060618 and R070526.2, respectively). ...

..., dumortierite, and tourmaline-supergroup minerals, (b) rare-element- and rare-earth-element-bearing minerals such as columbite-(Fe), uranopolycrase, fergusonite-(Y), uraninite, xenotime-(Y), and monazite-(Ce), (c) Ca-, F-, and K-dominant amphiboles, (d) phosphates (fluorapatite, isokite, wagnerite), (e...

... and is the major phosphorus-bearing phase, while apatite is absent. In domain 3 (Ca/(Ca+Mg) ~ 0.25), wagnerite reacted with the intruding felsic melt and is now rimmed by apatite. Isokite, CaMg[PO 4 F], was not observed and seems not to be stable at UHT-conditions. Wagnerite from Anakapalle is characterised...

...A. Isaacs; D. R. Peacor; W. C. Kelly Abstract Thadeuite occurs as a massive coarse-grained yellow-orange mineral in specimens from selvages of the hydrothermal vein system at Panasqueira, Portugal. It is associated with fluorapatite, wolfeite, the OH-bearing equivalent of isokite, althausite, topaz...

... * Childrenite–Eosphorite (Fe 2+ ,Mn 2+ )Al(PO 4 )(OH) 2 ·H 2 0 * ** *** Gormanite Fe 2+ 3 A1 4 (PO 4 ) 4 (OH) 6 ·2H 2 0 * ** Goyazite SrAl 3 (PO 4 )(PO 3 OH)·(OH) 6 * ** Isokite CaMg(PO 4 )F ** Mitridatite Ca 2 Fe 3+ 3 O 2 (PO 4 ) 3 ·3H 2 0...

... in oil. Reflectance percentages for R min and R max in air (and in oil) are 13.6, 14.4 (3.0, 3.7) (470 nm), 13.2, 13.9 (2.9, 3.5) (546 nm), 13.0, 13.7 (2.8, 3.4) (589 nm), 12.8, 13.4 (2.7, 3.2) (650 nm), respectively. Isokite, CaMg(PO) 4 F, has been found from boulders in the Senhora de...

... in this section, which is a compilation of The Crystal Chemistry of Phosphate Minerals (Huminicki and Hawthorne). I could not catch this chapter out. With the patience to look, I found information on bakhchisaraitsevite, isokite, fransoletite and parafransoletite; nothing was too obscure or new to have its...

..., 1938 ). The two phosphate minerals isokite, CaMgF(PO 4 ) ( Deans et al. , 1955 ), and panasqueiraite, CaMg(OH)PO 4 ( Isaacs & Peacor, 1981 ), are also assumed to have a titanite-type structure, although their crystal structures have not been studied yet. In narsarsukite, there is no pseudo...

... minerals, which have formed as the result of intense weathering of primary triplite–zwieselite, fluorapatite and isokite in association with sulfide minerals, e.g . sphalerite, arsenopyrite and chalcopyrite ( Alves et al. , 2012 ). Two types of secondary phosphate assemblages occur in the deposit...

... diffraction pattern (57.3 mm Debye-Scherer camera, Cu K α radiation, indexed by analogy with skutterudite) include [ d in Å (I%, hkl )]: 2.858(100,310), 2.182(90,321), 1.829(70,420), 1.667(50,422), 1.602(70,510), 1.402(60,530). H. Yang, J. Zwick, R.T. Downs, G. Costin (2007) Isokite, CaMg(PO 4 )F 0.8...

..., the mineral is always intergrown with white to pale yellow supergene fluorapatite. Fluorine-rich crandallite, whitish crystals of kolbeckite, and whitish earthy aggregates of younger generation of isokite are also found with some specimens of krásnoite. Two different mineral assemblages commonly host...

... northeast of the tassieite locality, one of several lineaments that Stüwe et al . (1989) mapped in the Larsemann Hills using aerial photography. Halogen and silica activities in the hydrothermal fluids were sufficiently low to stabilize hydrous Ca ± Na – Mg – Fe phosphates. Isokite, Ca(Mg,Fe)PO 4 (F,OH...

... Sciences , 9 , 561 –562. Yang, H., Zwick, J., Downs, R.T., and Costin, G. ( 2007a ). Isokite, CaMg(PO 4 )F, isostructural with titanite. Acta Crystallographica , C63 , i89 –i90. Yang, H., Sano, J.L., Eichler, C., Downs, R.T., and Costin, G. ( 2007b ) Iranite, CuPb 10 (CrO 4 ) 6 (SiO 4 ) 2 (OH) 2...

... and fluorarsenates of the durangite group ( Back, 2014 ; some authors prefer the name tilasite group), namely isokite CaMg(PO 4 )F, lacroixite NaAl(PO 4 )F, panasqueiraite Ca(Mg,Fe)(PO 4 )(OH,F), durangite NaAl(AsO 4 )F, maxwellite NaFe 3+ (AsO 4 )F, and tilasite CaMg(AsO 4 )F. We propose to include kononovite...