TY - JOUR
T1 - From structure topology to chemical composition. XXVIII. Titanium silicates
T2 - Jinshajiangite from the Oktyabr'skii massif, Donetsk region, Ukraine, a new occurrence
AU - Day, Maxwell C.
AU - Sokolova, Elena
AU - Hawthorne, Frank C.
AU - Downs, Robert T.
N1 - Funding Information:
We are grateful to the reviewer Fernando Cámara for useful comments and Associate Editor Jim Evans for handling the manuscript. We thank David Herbert (Department of Chemistry, University of Manitoba) for use of the Bruker D8 QUEST ECO CMOS diffractometer for collection of the single-crystal X-ray data for jinshajiangite. This work was supported by a Discovery Grant from the Natural Sciences and Engineering Research Council of Canada to FCH.
Publisher Copyright:
© 2020 Mineralogical Association of Canada. All rights reserved.
PY - 2020
Y1 - 2020
N2 - Here we report electron-microprobe data and unit-cell parameters for jinshajiangite, ideally NaBaFe2þ 4Ti2(Si2O7)2 O2(OH)2F, from a new locality: the Oktyabr'skii massif in the coastal area of the Azov Sea, Donetsk region, Ukraine. Chemical analysis by electron microprobe gave Nb2O5 1.59, ZrO2 0.61, TiO2 17.07, SiO2 27.60, Al2O3 0.08, Fe2O3 2.04, FeO 16.42, BaO 9.81, ZnO 0.76, MnO 12.97, CaO 1.82, MgO 0.07, K2O 2.05, Na2O 2.51, F 2.48, H2O 1.92, O ¼ F -1.04, sum 98.76 wt.%; H2O was determined in accord with the required number of monovalent anions for the Ti-dominant perraultite-type minerals: OH þ F ¼ 3 pfu; the Fe3þ/Fe2þ ratio was assigned in accord with Mössbauer-spectroscopy results for jinshajiangite from a different locality. The empirical formula calculated on the basis of 19 (O þ F) is (Na0.71Ca0.28 A0.01)R1(Ba0.56K0.38A0.06)R1(Fe2þ 1.99Mn1.59Fe3þ 0.22Zn0.08Mg0.02Al0.01A0.09)R4 (Ti1.86Nb0.10Zr0.04)R2(Si4.00O14)O2 [(OH)1.86F0.14]R2F1.00, Z ¼ 4. Unit-cell parameters from the single-crystal data were determined by least-squares refinement of 9807 reflections with I. 10rI and are as follows: a ¼ 10.726(8), b ¼ 13.834(10), c ¼ 11.065(8) Å, a ¼ 108.172(5), b ¼ 99.251(7), c ¼ 90.00(1)8, V ¼ 1537.5(3.4) Å3, space group C-1.
AB - Here we report electron-microprobe data and unit-cell parameters for jinshajiangite, ideally NaBaFe2þ 4Ti2(Si2O7)2 O2(OH)2F, from a new locality: the Oktyabr'skii massif in the coastal area of the Azov Sea, Donetsk region, Ukraine. Chemical analysis by electron microprobe gave Nb2O5 1.59, ZrO2 0.61, TiO2 17.07, SiO2 27.60, Al2O3 0.08, Fe2O3 2.04, FeO 16.42, BaO 9.81, ZnO 0.76, MnO 12.97, CaO 1.82, MgO 0.07, K2O 2.05, Na2O 2.51, F 2.48, H2O 1.92, O ¼ F -1.04, sum 98.76 wt.%; H2O was determined in accord with the required number of monovalent anions for the Ti-dominant perraultite-type minerals: OH þ F ¼ 3 pfu; the Fe3þ/Fe2þ ratio was assigned in accord with Mössbauer-spectroscopy results for jinshajiangite from a different locality. The empirical formula calculated on the basis of 19 (O þ F) is (Na0.71Ca0.28 A0.01)R1(Ba0.56K0.38A0.06)R1(Fe2þ 1.99Mn1.59Fe3þ 0.22Zn0.08Mg0.02Al0.01A0.09)R4 (Ti1.86Nb0.10Zr0.04)R2(Si4.00O14)O2 [(OH)1.86F0.14]R2F1.00, Z ¼ 4. Unit-cell parameters from the single-crystal data were determined by least-squares refinement of 9807 reflections with I. 10rI and are as follows: a ¼ 10.726(8), b ¼ 13.834(10), c ¼ 11.065(8) Å, a ¼ 108.172(5), b ¼ 99.251(7), c ¼ 90.00(1)8, V ¼ 1537.5(3.4) Å3, space group C-1.
KW - Donetsk region
KW - Electron-microprobe analysis
KW - Jinshajiangite
KW - Oktyabr'skii massif
KW - Perraultite
KW - Seidozerite supergroup
KW - TS block
KW - Ukraine
KW - Unit-cell parameters
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U2 - 10.3749/canmin.1900089
DO - 10.3749/canmin.1900089
M3 - Article
AN - SCOPUS:85084329990
VL - 58
SP - 223
EP - 229
JO - Canadian Mineralogist
JF - Canadian Mineralogist
SN - 0008-4476
IS - 2
ER -