Geology of Ore Deposits

, Volume 53, Issue 7, pp 583–590 | Cite as

Oxyphlogopite K(Mg,Ti,Fe)3[(Si,Al)4O10](O,F)2: A new mineral species of the mica group

  • N. V. Chukanov
  • A. A. Mukhanova
  • R. K. Rastsvetaeva
  • D. I. Belakovsky
  • S. Möckel
  • O. V. Karimova
  • S. N. Britvin
  • S. V. Krivovichev
New Minerals

Abstract

Oxyphlogopite is a new mica-group mineral with the idealized formula K(Mg,Ti,Fe)3[(Si,Al)4O10](O,F)2. The holotype material came from a basalt quarry at Mount Rothenberg near Mendig at the Eifel volcanic complex in Rhineland-Palatinate, Germany. The mineral occurs as crystals up to 4 × 4 × 0.2 mm in size encrusting cavity walls in alkali basalt. The associated minerals are nepheline, plagioclase, sanidine, augite, diopside, and magnetite. Its color is dark brown, its streak is brown, and its luster is vitreous. Dmeas = 3.06(1) g/cm3 (flotation in heavy liquids), and Dcalc = 3.086 g/cm3. The IR spectrun does not contain bands of OH groups. Oxyphlogopite is biaxial (negative); α = 1.625(3), β = 1.668(1), and γ = 1.669(1); and 2Vmeas = 16(2)° and 2Vcalc = 17°. The dispersion is strong; r < ν. The pleochroism is medium; X > Y > Z (brown to dark brown). The chemical composition is as follows (electron microprobe, mean of 5 point analyses, wt %; the ranges are given in parentheses; the H2O was determined using the Alimarin method; the Fe2+/Fe3+ was determined with X-ray emission spectroscopy): Na2O 0.99 (0.89–1.12), K2O 7.52 (7.44–7.58), MgO 14.65 (14.48–14.80), CaO 0.27 ((0.17–0.51), FeO 4.73, Fe2O3 7.25 (the range of the total iron in the form of FeO is 11.09–11.38), Al2O3 14.32 (14.06–14.64), Cr2O3 0.60 (0.45–0.69), SiO2 34.41 (34.03–34.66), TiO2 12.93 (12.69–13.13), F 3.06 (2.59–3.44), H2O 0.14; O=F2 −1.29; 99/58 in total. The empirical formula is (K0.72Na0.14Ca0.02)(Mg1.64Ti0.73Fe0.302+ Fe0.273+Cr0.04)Σ2.98(Si2.59Al1.27Fe0.143+ O10) O1.20F0.73(OH)0.07. The crystal structure was refined on a single crystal. Oxyphlogopite is monoclinic with space group C2/m; the unit-cell parameters are as follows: a = 5.3165(1), b = 9.2000(2), c = 10.0602(2) Å, β = 100.354(2)°. The presence of Ti results in the strong distortion of octahedron M(2). The strongest lines of the X-ray powder diffraction pattern [d, Å (I, %) [hkl]] are as follows: 9.91(32) [001], 4.53(11) 110], 3.300(100) [003], 3.090(12) [112], 1.895(21) [005], 1.659(12) [−135], 1.527(16) [−206, 060]. The type specimens of oxyphlogopite are deposited at the Fersman Mineralogical Museum in Moscow, Russia; the registration numbers are 3884/2 (holotype) and 3884/1 (cotype).

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Copyright information

© Pleiades Publishing, Ltd. 2011

Authors and Affiliations

  • N. V. Chukanov
    • 1
  • A. A. Mukhanova
    • 2
  • R. K. Rastsvetaeva
    • 3
  • D. I. Belakovsky
    • 4
  • S. Möckel
    • 5
  • O. V. Karimova
    • 6
  • S. N. Britvin
    • 7
  • S. V. Krivovichev
    • 7
  1. 1.Institute of Problems of Chemical PhysicsRussian Academy of SciencesChernogolovka, Moscow oblastRussia
  2. 2.Institute of Experimental MineralogyRussian Academy of SciencesChernogolovka, Moscow oblastRussia
  3. 3.Institute of CrystallographyRussian Academy of SciencesMoscowRussia
  4. 4.Fersman Mineralogical MuseumRussian Academy of SciencesMoscowRussia
  5. 5.Alpha-GeophysikGotthelffriedrichsgrundGermany
  6. 6.Institute of Geology of Ore Deposits, Petrography, Mineralogy, and GeochemistryRussian Academy of SciencesMoscowRussia
  7. 7.Faculty of GeologySt. Petersburg State UniversitySt. PetersburgRussia

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