GAJARDOITE-(NH4), (NH4)As3+ 4O6Cl2[(Ca0.5□0.5)(H2O)5], A NEW MINERAL FROM THE KHOVU-AKSY DEPOSIT, EASTERN SIBERIA, RUSSIA
The new mineral gajardoite-(NH4), ideally (NH4)As3+4O6Cl2[(Ca0.5□0.5)(H2O)5], is found at the Khovu-Aksy Ni-Co deposit, Republic of Tyva, Russia. Gajardoite-(NH4) occurs as tiny lamellar coarsely hexagonal or irregular curved and divergent crystals up to 0.01 mm in size. The crystals are combined in...
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South Urals Federal Research Center of Mineralogy and Geoecology UB RAS
2024-03-01
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| Series: | Минералогия |
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| Online Access: | https://journal.mineralogy.ru/wp-content/uploads/2024/04/2024_10_1_1.pdf |
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| author | A.V. Kasatkin V.V. Gurzhiy N.V. Chukanov A.A. Agakhanov R. Škoda D.I. Belakovskiy |
| author_facet | A.V. Kasatkin V.V. Gurzhiy N.V. Chukanov A.A. Agakhanov R. Škoda D.I. Belakovskiy |
| author_sort | A.V. Kasatkin |
| collection | DOAJ |
| description | The new mineral gajardoite-(NH4), ideally (NH4)As3+4O6Cl2[(Ca0.5□0.5)(H2O)5], is found at the Khovu-Aksy Ni-Co deposit, Republic of Tyva, Russia. Gajardoite-(NH4) occurs as tiny lamellar coarsely hexagonal or irregular curved and divergent crystals up to 0.01 mm in size. The crystals are combined in groups, rosette-like clusters or spherulitic aggregates up to 0.2 mm, which are intimately intergrown with annabergite, arsenolite, and pharmacolite on a matrix of skutterudite, safflorite, and other minerals. The new mineral is colorless, white in aggregates, transparent with a white streak and a vitreous lustre. It is brittle, with a perfect cleavage on {001}. The Mohs hardness is ~1½. The calculated density (Dcalc) is 2.583 g/cm3 .Gajardoite-(NH4) is optically non-pleochroic, uniaxial (–), ω = 1.745(10), ε = 1.558(5) (589 nm). The chemical composition determined by electron microprobe (wt. %, H2O content calculated by stoichiometry) is as follows: (NH4)2O 3.17, Na2O 0.40, K2O 1.07, CaO 5.28, As2O3 67.25, Cl 12.21, H2O 15.30, O=Cl –2.76, total 101.92. The empirical formula based on four As and 11 O atoms per formula unit is [(NH4)0.72K0.13Na0.08]Σ0.93Ca0.55As3+4O6Cl2.03(H2O)5. Gajardoite-(NH4) is hexagonal, space group P6/mmm; the unit-cell parameters are as follows: a = 5.263(3), c = 16.078(5) Å, V = 385.8(5) Å3 , Z = 1. The strongest lines of the powder X-ray diffraction pattern [d, Å (I, %) (hkl)] include 16.08 (34) (001), 5.36 (34) (003), 4.565 (41) (100), 3.466 (23) (103), 2.637 (100) (110), 2.360 (25) (113). Gajardoite-(NH4) is an ammonium analog of gajardoite KCa0.5As3+4O6Cl2 • 5H2O. Their structural identity is confirmed by powder X-ray diffraction and infrared and Raman spectroscopy. |
| format | Article |
| id | doaj-art-c356a6561bd749cb94eaebd105f67c15 |
| institution | Kabale University |
| issn | 2313-545X 2782-2044 |
| language | English |
| publishDate | 2024-03-01 |
| publisher | South Urals Federal Research Center of Mineralogy and Geoecology UB RAS |
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| series | Минералогия |
| spelling | doaj-art-c356a6561bd749cb94eaebd105f67c152025-02-06T11:56:18ZengSouth Urals Federal Research Center of Mineralogy and Geoecology UB RASМинералогия2313-545X2782-20442024-03-0110151610.35597/2313-545X-2024-10-1-1GAJARDOITE-(NH4), (NH4)As3+ 4O6Cl2[(Ca0.5□0.5)(H2O)5], A NEW MINERAL FROM THE KHOVU-AKSY DEPOSIT, EASTERN SIBERIA, RUSSIAA.V. Kasatkin0V.V. Gurzhiy1N.V. Chukanov2A.A. Agakhanov3R. Škoda4D.I. Belakovskiy5Fersman Mineralogical Museum RASSt. Petersburg State UniversityFederal Research Center of Problems of Chemical Physics and Medicinal Chemistry RASFersman Mineralogical Museum RASMasaryk UniversityFersman Mineralogical Museum RASThe new mineral gajardoite-(NH4), ideally (NH4)As3+4O6Cl2[(Ca0.5□0.5)(H2O)5], is found at the Khovu-Aksy Ni-Co deposit, Republic of Tyva, Russia. Gajardoite-(NH4) occurs as tiny lamellar coarsely hexagonal or irregular curved and divergent crystals up to 0.01 mm in size. The crystals are combined in groups, rosette-like clusters or spherulitic aggregates up to 0.2 mm, which are intimately intergrown with annabergite, arsenolite, and pharmacolite on a matrix of skutterudite, safflorite, and other minerals. The new mineral is colorless, white in aggregates, transparent with a white streak and a vitreous lustre. It is brittle, with a perfect cleavage on {001}. The Mohs hardness is ~1½. The calculated density (Dcalc) is 2.583 g/cm3 .Gajardoite-(NH4) is optically non-pleochroic, uniaxial (–), ω = 1.745(10), ε = 1.558(5) (589 nm). The chemical composition determined by electron microprobe (wt. %, H2O content calculated by stoichiometry) is as follows: (NH4)2O 3.17, Na2O 0.40, K2O 1.07, CaO 5.28, As2O3 67.25, Cl 12.21, H2O 15.30, O=Cl –2.76, total 101.92. The empirical formula based on four As and 11 O atoms per formula unit is [(NH4)0.72K0.13Na0.08]Σ0.93Ca0.55As3+4O6Cl2.03(H2O)5. Gajardoite-(NH4) is hexagonal, space group P6/mmm; the unit-cell parameters are as follows: a = 5.263(3), c = 16.078(5) Å, V = 385.8(5) Å3 , Z = 1. The strongest lines of the powder X-ray diffraction pattern [d, Å (I, %) (hkl)] include 16.08 (34) (001), 5.36 (34) (003), 4.565 (41) (100), 3.466 (23) (103), 2.637 (100) (110), 2.360 (25) (113). Gajardoite-(NH4) is an ammonium analog of gajardoite KCa0.5As3+4O6Cl2 • 5H2O. Their structural identity is confirmed by powder X-ray diffraction and infrared and Raman spectroscopy.https://journal.mineralogy.ru/wp-content/uploads/2024/04/2024_10_1_1.pdfgajardoite-(nh4)new mineralchemical compositionpowder x-ray diffractionir spectrumraman spectrumgajardoitekhovu-aksy depositeastern siberia |
| spellingShingle | A.V. Kasatkin V.V. Gurzhiy N.V. Chukanov A.A. Agakhanov R. Škoda D.I. Belakovskiy GAJARDOITE-(NH4), (NH4)As3+ 4O6Cl2[(Ca0.5□0.5)(H2O)5], A NEW MINERAL FROM THE KHOVU-AKSY DEPOSIT, EASTERN SIBERIA, RUSSIA Минералогия gajardoite-(nh4) new mineral chemical composition powder x-ray diffraction ir spectrum raman spectrum gajardoite khovu-aksy deposit eastern siberia |
| title | GAJARDOITE-(NH4), (NH4)As3+ 4O6Cl2[(Ca0.5□0.5)(H2O)5], A NEW MINERAL FROM THE KHOVU-AKSY DEPOSIT, EASTERN SIBERIA, RUSSIA |
| title_full | GAJARDOITE-(NH4), (NH4)As3+ 4O6Cl2[(Ca0.5□0.5)(H2O)5], A NEW MINERAL FROM THE KHOVU-AKSY DEPOSIT, EASTERN SIBERIA, RUSSIA |
| title_fullStr | GAJARDOITE-(NH4), (NH4)As3+ 4O6Cl2[(Ca0.5□0.5)(H2O)5], A NEW MINERAL FROM THE KHOVU-AKSY DEPOSIT, EASTERN SIBERIA, RUSSIA |
| title_full_unstemmed | GAJARDOITE-(NH4), (NH4)As3+ 4O6Cl2[(Ca0.5□0.5)(H2O)5], A NEW MINERAL FROM THE KHOVU-AKSY DEPOSIT, EASTERN SIBERIA, RUSSIA |
| title_short | GAJARDOITE-(NH4), (NH4)As3+ 4O6Cl2[(Ca0.5□0.5)(H2O)5], A NEW MINERAL FROM THE KHOVU-AKSY DEPOSIT, EASTERN SIBERIA, RUSSIA |
| title_sort | gajardoite nh4 nh4 as3 4o6cl2 ca0 5□0 5 h2o 5 a new mineral from the khovu aksy deposit eastern siberia russia |
| topic | gajardoite-(nh4) new mineral chemical composition powder x-ray diffraction ir spectrum raman spectrum gajardoite khovu-aksy deposit eastern siberia |
| url | https://journal.mineralogy.ru/wp-content/uploads/2024/04/2024_10_1_1.pdf |
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