Research output: Contribution to journal › Article › peer-review
Reznitskyite, CaMg(VO 4)F, a new mineral from the Tolbachik volcano, Kamchatka, Russia and the first vanadate with a titanite-type structure. / Koshlyakova, Natalia N.; Pekov, Igor V.; Vigasina, Marina F.; Zubkova, Natalia V.; Agakhanov, Atali A.; Britvin, Sergey N.; Sidorov, Evgeny G.; Pushcharovsky, Dmitry Yu.
In: Mineralogical Magazine, Vol. 86, No. 2, 04.04.2022, p. 307-313.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Reznitskyite, CaMg(VO 4)F, a new mineral from the Tolbachik volcano, Kamchatka, Russia and the first vanadate with a titanite-type structure
AU - Koshlyakova, Natalia N.
AU - Pekov, Igor V.
AU - Vigasina, Marina F.
AU - Zubkova, Natalia V.
AU - Agakhanov, Atali A.
AU - Britvin, Sergey N.
AU - Sidorov, Evgeny G.
AU - Pushcharovsky, Dmitry Yu
N1 - Publisher Copyright: Copyright © The Author(s), 2022.
PY - 2022/4/4
Y1 - 2022/4/4
N2 - Reznitskyite, ideally CaMg(VO4)F, is a new mineral species of the tilasite group from the Arsenatnaya fumarole, Northern Breakthrough of the Great Tolbachik Fissure Eruption, Tolbachik volcano, Kamchatka, Russia. It occurs as zones (usually up to 0.05 mm thick) in crystals of V- and P-containing tilasite or as homogeneous grains up to 0.1 mm across. It was found in polymineralic sublimate encrustations in association with minerals of the svabite-fluorapatite-pliniusite system and the schäferite-berzeliite, tilasite-isokite, wagnerite-arsenowagnerite and udinaite-arsenudinaite series. The mineral assemblage also includes calciojohillerite, diopside, forsterite, titanite, rhabdoborite-(V), rhabdoborite-(W), rhabdoborite-(Mo), ludwigite, powellite, scheelite, hematite, baryte and magnesioferrite. Reznitskyite is transparent or semi-transparent, colourless, with vitreous lustre. Dcalc. = 3.453 g cm-3. Under the microscope, in reflected light reznitskyite is grey, non-pleochroic, with very weak bireflectance (ΔR589 nm = 0.5%) and distinct anisotropy. Reznitskyite is the first vanadate with a titanite-type structure. It is monoclinic, space group C2/c, a = 6.6912(7), b = 8.9395(7), c = 7.0587(8) Å, β = 113.078(13)°, V = 388.43(8) Å3 and Z = 4. The strongest reflections of the powder X-ray diffraction pattern are [d in Å(I)(hkl)]: 3.082(100)(200), 3.250(66)(1¯12, 002), 2.631(44)(022), 2.854(34)(2¯02), 2.683(33)(130), 3.686(26)(021), 2.531(25)(220), 1.749(25)(3¯32, 2¯04) and 2.344(24)(131). Electron microprobe analysis gave (wt.%) MgO 20.44, CaO 26.83, P2O5 6.24, V2O5 21.09, As2O5 18.97, SO3 0.47, F 9.42, -O=F -3.97, with a total of 99.49. The empirical formula of reznitskyite, calculated on the basis of O+F = 5 atoms per formula unit, is: Ca0.97Mg1.03(V0.47As0.33P0.18S0.01)Σ0.99O3.99F1.01. Reznitskyite is a vanadate analogue of tilasite CaMg(AsO4)F and isokite CaMg(PO4)F. The mineral is named in honour of the outstanding Russian mineralogist Leonid Zinovievich Reznitsky (born 1938) who has made significant contribution to the mineralogy of vanadium.
AB - Reznitskyite, ideally CaMg(VO4)F, is a new mineral species of the tilasite group from the Arsenatnaya fumarole, Northern Breakthrough of the Great Tolbachik Fissure Eruption, Tolbachik volcano, Kamchatka, Russia. It occurs as zones (usually up to 0.05 mm thick) in crystals of V- and P-containing tilasite or as homogeneous grains up to 0.1 mm across. It was found in polymineralic sublimate encrustations in association with minerals of the svabite-fluorapatite-pliniusite system and the schäferite-berzeliite, tilasite-isokite, wagnerite-arsenowagnerite and udinaite-arsenudinaite series. The mineral assemblage also includes calciojohillerite, diopside, forsterite, titanite, rhabdoborite-(V), rhabdoborite-(W), rhabdoborite-(Mo), ludwigite, powellite, scheelite, hematite, baryte and magnesioferrite. Reznitskyite is transparent or semi-transparent, colourless, with vitreous lustre. Dcalc. = 3.453 g cm-3. Under the microscope, in reflected light reznitskyite is grey, non-pleochroic, with very weak bireflectance (ΔR589 nm = 0.5%) and distinct anisotropy. Reznitskyite is the first vanadate with a titanite-type structure. It is monoclinic, space group C2/c, a = 6.6912(7), b = 8.9395(7), c = 7.0587(8) Å, β = 113.078(13)°, V = 388.43(8) Å3 and Z = 4. The strongest reflections of the powder X-ray diffraction pattern are [d in Å(I)(hkl)]: 3.082(100)(200), 3.250(66)(1¯12, 002), 2.631(44)(022), 2.854(34)(2¯02), 2.683(33)(130), 3.686(26)(021), 2.531(25)(220), 1.749(25)(3¯32, 2¯04) and 2.344(24)(131). Electron microprobe analysis gave (wt.%) MgO 20.44, CaO 26.83, P2O5 6.24, V2O5 21.09, As2O5 18.97, SO3 0.47, F 9.42, -O=F -3.97, with a total of 99.49. The empirical formula of reznitskyite, calculated on the basis of O+F = 5 atoms per formula unit, is: Ca0.97Mg1.03(V0.47As0.33P0.18S0.01)Σ0.99O3.99F1.01. Reznitskyite is a vanadate analogue of tilasite CaMg(AsO4)F and isokite CaMg(PO4)F. The mineral is named in honour of the outstanding Russian mineralogist Leonid Zinovievich Reznitsky (born 1938) who has made significant contribution to the mineralogy of vanadium.
KW - Arsenatnaya fumarole
KW - fumarole sublimate
KW - new mineral
KW - tilasite group
KW - titanite group
KW - Tolbachik volcano
KW - vanadate
UR - http://www.scopus.com/inward/record.url?scp=85126601515&partnerID=8YFLogxK
UR - https://www.mendeley.com/catalogue/db0909a5-73ca-3d9e-9957-38748ad1421b/
U2 - 10.1180/mgm.2022.16
DO - 10.1180/mgm.2022.16
M3 - Article
AN - SCOPUS:85126601515
VL - 86
SP - 307
EP - 313
JO - Mineralogical Magazine
JF - Mineralogical Magazine
SN - 0026-461X
IS - 2
ER -
ID: 95095012