Title: Fluor-ferro-leakeite, NaNa<sub>2</sub>(Fe (super 2+)<sub>2</sub>Fe (super 3+)<sub>2</sub>Li)Si<sub>8</sub>O<sub>22</sub>F<sub>2</sub>, a new alkali amphibole from the Canada Pinabete Pluton, Questa, New Mexico, U.S.A.
Abstract: Other| February 01, 1996 Fluor-ferro-leakeite, NaNa2(Fe2+2Fe3+2Li)Si8O22F2, a new alkali amphibole from the Canada Pinabete Pluton, Questa, New Mexico, U.S.A. Frank C. Hawthorne; Frank C. Hawthorne University of Manitoba, Department of Geological Sciences, Winnipeg, MB, Canada Search for other works by this author on: GSW Google Scholar Roberta Oberti; Roberta Oberti Search for other works by this author on: GSW Google Scholar Luciano Ungaretti; Luciano Ungaretti Search for other works by this author on: GSW Google Scholar Luisa Ottolini; Luisa Ottolini Search for other works by this author on: GSW Google Scholar Joel D. Grice; Joel D. Grice Search for other works by this author on: GSW Google Scholar Gerald K. Czamanske Gerald K. Czamanske Search for other works by this author on: GSW Google Scholar American Mineralogist (1996) 81 (1-2): 226–228. https://doi.org/10.2138/am-1996-1-227 Article history first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation Frank C. Hawthorne, Roberta Oberti, Luciano Ungaretti, Luisa Ottolini, Joel D. Grice, Gerald K. Czamanske; Fluor-ferro-leakeite, NaNa2(Fe2+2Fe3+2Li)Si8O22F2, a new alkali amphibole from the Canada Pinabete Pluton, Questa, New Mexico, U.S.A.. American Mineralogist 1996;; 81 (1-2): 226–228. doi: https://doi.org/10.2138/am-1996-1-227 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyAmerican Mineralogist Search Advanced Search Abstract Fluor-ferro-leakeite is a new amphibole species from the Canada Pinabete pluton, Questa, New Mexico, U.S.A.; it occurs in association with quartz, alkali feldspar, acmite, ilmenite, and zircon. It forms as anhedral bluish black crystals elongated along c and up to 1 mm long. It is brittle, H = 6, Dmeas = 3.37 g/cm3, Dcalc = 3.34 g/cm3. In plane-polarized light, it is strongly pleochroic, X = very dark indigo blue, Y = gray blue, Z = yellow green; X ∧ c = 10° (in β obtuse), Y = b, Z ∧ a = 4° (in β obtuse), with absorption X > Y > Z. Fluor-ferro-leakeite is biaxial positive, α = 1.675(2), β = 1.683(2), γ = 1.694(1); 2V = 87(2)°; dispersion is not visible because of the strong absorption.Fluor-ferro-leakeite is monoclinic, space group C2/m, a = 9.792(1), b = 17.938(1), c = 5.3133(4) Å, β = 103.87(7)°, V = 906.0(1) Å3, Z = 2. The ten strongest X-ray diffraction lines in the powder pattern are [d(I,hkl)]: 2.710(100,151), 2.536(92,202), 3.404(57,131), 4.481(54,040), 8.426(45,110), 2.985(38,241), 2.585(38,061), 3.122(29,310), 2.165(26,261), and 1.586(25,403). Analysis by a combination of electron microprobe, ion microprobe, and crystal-structure refinement (Hawthorne et al. 1993) gives SiO2 51.12, Al2O3 1.13, TiO2 0.68, Fe2O3 16.73, FeO 8.87, MgO 2.02, MnO 4.51, ZnO 0.57, CaO 0.15, Na2O 9.22, K2O 1.19, Li2O 0.99, F 2.87, H2Ocalc 0.60, sum 99.44 wt%. The formula unit, calculated on the basis of 23 O atoms, is (K0.23Na0.76)(Na1.97Ca0.03)(Mg0.46Fe1.142+Mn0.592+ Zn0.07Fe1.932+-Ti0.08Al0.02Li0.61)(Si7.81Al0.19)O22(F1.39OH0.61). A previous crystal-structure refinement (Hawthorne et al. 1993) shows Li to be completely ordered at the M3 site. Fluor-ferro-leakeite, ideally NaNa2(Fe22+Fe23+ Li)Si8O22F2, is related to leakeite, NaNa2(Mg2Fe33+Li)Si8O22(OH)2, by the substitutions Fe2+ → Mg and F → OH. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
Publication Year: 1996
Publication Date: 1996-02-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 21
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