Startseite Ferro-papikeite, ideally NaFe2 2+(Fe32+Al2)(Si5Al3)O22(OH)2, a new orthorhombic amphibole from Nordmark (Western Bergslagen), Sweden: Description and crystal structure
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Ferro-papikeite, ideally NaFe2 2+(Fe32+Al2)(Si5Al3)O22(OH)2, a new orthorhombic amphibole from Nordmark (Western Bergslagen), Sweden: Description and crystal structure

  • Frank C. Hawthorne , Maxwell C. Day , Mostafa Fayek , Kees Linthout , Wim. J. Lustenhouwer und Roberta Oberti
Veröffentlicht/Copyright: 26. Januar 2022
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American Mineralogist
Aus der Zeitschrift American Mineralogist Band 107 Heft 2

Abstract

Ferro-papikeite, ideally NaFe22+(Fe32+Al2)(Si5Al3)O22(OH)2, is a new mineral of the amphibole supergroup from the Filipstad Municipality, Värmland County, Central Sweden, where it occurs in a medium-grade felsic metavolcanic rock. Ferro-papikeite is pale brown with a translucent luster, has a colorless to very pale-brown streak, and shows no fluorescence under long-wave or short-wave ultraviolet light. Grains are subhedral, 0.4–3.0 mm in size, and show well-developed {210} cleavage. It has a Mohs hardness of ~6 and is brittle with a splintery fracture, has the characteristic perfect {210} cleavage of orthorhombic amphiboles, intersecting at ~56°, and the calculated density is 3.488 g/cm3. In transmitted plane-polarized light, ferro-papikeite is moderately pleochroic X = very pale brown, Y = Z = honey brown; X < Y = Z. Ferro-papikeite is biaxial (+), α = 1.674(2), β = 1.692(2), γ = 1.716(2), 2Vmeas = 86.2(9) and 2Vcalc = 88.3°, dispersion is r < v, weak. The orientation is: X || a, Y || b, Z || c.

Ferro-papikeite is orthorhombic, space group Pnma, a = 18.628(4), b = 17.888(4), c = 5.3035(11) Å, V = 1767.2(6) Å3, Z = 4. The strongest ten X‑ray diffraction lines in the powder pattern are [d in Å(I) (hkl)]: 8.255(100)(210), 3.223(39)(440), 3.057(68)(610), 2.824(28)(251), 2.674(41)(351), 2.572(56) (161,621), 2.549(38)(202), 2.501(50)(261,451), 2.158(25)(502), and 1.991(31)(661). Chemical analysis by electron microprobe gave SiO2 36.50, Al2O3 22.24, TiO2 0.09, FeO 31.54, MnO 0.65, MgO 5.48, CaO 0.08, Na2O 2.35, F 0.22, H2Ocalc 1.85, O=F –0.09, sum 100.91 wt%. The formula unit, calculated on the basis of 24 (O+OH+F) with (OH) = 2 apfu and Fe3+ = 0.13 apfu (determined from the <M2–O> distance) is A(Na0.70Ca0.01)B+C(Mg1.25Fe23.90+ Mn20.08+ Al1.62Fe30.13+ Ti40.01+ )Σ6.99T(Si5.60Al2.40)Σ8O22(OH1.89F0.11)2. The crystal structure of ferro-papikeite was refined to an R-index of 3.60% using 2335 unique observed reflections collected with MoKa X-radiation. [4]Al3+ is ordered over the four T sites as follows: T 1B > T1A > T2B >> T2a, [6]Al3+ is completely ordered at M2, and Fe2+ is strongly ordered at M4. The A site is split with Na+ strongly ordered at A1. End-member ferro-papikeite is related to end-member gedrite, □Mg2(Mg3Al2)(Si6Al2)O22(OH)2, by the substitutions Na+ → □, Fe2+ → Mg, and Al3+ → Si4+. The description of ferro-papikeite as a new species further emphasizes the compositional similarities between the monoclinic calcium amphiboles and the orthorhombic magnesium-iron-manganese amphiboles.

Keywords: Ferro-papikeite; new amphibole; electron-microprobe analysis; optical properties; crystal-structure refinement; Bergslagen, Sweden

Acknowledgments and Funding

We thank John Hughes and Gordon Brown, Jr. for their very good comments on this paper. We thank Alfredo Camacho, Department of Geological Sciences, University of Manitoba, for arranging for thin sections to be cut, and for help with the thin-section photography and interpretation. This work was supported by a Natural Sciences and Engineering Research Council of Canada Discovery Grant, and by Canada Foundation for Innovation grants to F.C.H.

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Received: 2020-10-31
Accepted: 2021-02-04
Published Online: 2022-01-26
Published in Print: 2022-02-23

© 2022 Mineralogical Society of America

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https://doi.org/10.2138/am-2021-7877
Schlagwörter für diesen Artikel
Ferro-papikeite; new amphibole; electron-microprobe analysis; optical properties; crystal-structure refinement; Bergslagen, Sweden

Artikel in diesem Heft

  1. Alumino-oxy-rossmanite from pegmatites in Variscan metamorphic rocks from Eibenstein an der Thaya, Lower Austria, Austria: A new tourmaline that represents the most Al-rich end-member composition
  2. Fluorine partitioning between quadrilateral clinopyroxenes and melt
  3. Multi-stage magma evolution recorded by apatite and zircon of adakite-like rocks: A case study from the Shatanjiao intrusion, Tongling region, Eastern China
  4. The physical and chemical evolution of magmatic fluids in near-solidus silicic magma reservoirs: Implications for the formation of pegmatites
  5. Texture, geochemistry, and geochronology of titanite and pyrite: Fingerprint of magmatic-hydrothermal fertile fluids in the Jiaodong Au province
  6. Polytypism in semi-disordered lizardite and amesite by low-dose HAADF-STEM
  7. Peralkalinity in peraluminous granitic pegmatites. I. Evidence from whewellite and hydrogen carbonate in fluid inclusions
  8. Peralkalinity in peraluminous granitic pegmatites. II. Evidence from experiments on carbonate formation in spodumene-bearing assemblages
  9. Ab initio study of structural, elastic and thermodynamic properties of Fe3S at high pressure: Implications for planetary cores
  10. Removal of barite from zircon using an aqueous solution of diethylenetriaminepentaacetic acid and potassium carbonate
  11. Improving grain size analysis using computer vision techniques and implications for grain growth kinetics
  12. Crystal chemistry of arsenian pyrites: A Raman spectroscopic study
  13. Formation of the Maoniuping giant REE deposit: Constraints from mineralogy and in situ bastnäsite U-Pb geochronology
  14. Amphibole as a witness of chromitite formation and fluid metasomatism in ophiolites
  15. Ferro-papikeite, ideally NaFe2 2+(Fe32+Al2)(Si5Al3)O22(OH)2, a new orthorhombic amphibole from Nordmark (Western Bergslagen), Sweden: Description and crystal structure
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  19. American Mineralogist thanks the 2021 reviewers
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