Research output: Contribution to journal › Article › peer-review
Bakakinite, Ca2V2O7, a new mineral from fumarolic exhalations of the Tolbachik volcano, Kamchatka, Russia. / Pekov, Igor V.; Agakhanov, Atali A.; Koshlyakova, Natalia N.; Zubkova, Natalia V.; Yapaskurt, Vasiliy O.; Britvin, Sergey N.; Vigasina, Marina F.; Turchkova, Anna G.; Nazarova, Maria A.
In: Mineralogical Magazine, Vol. 87, No. 5, 07.10.2023, p. 695-701.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Bakakinite, Ca2V2O7, a new mineral from fumarolic exhalations of the Tolbachik volcano, Kamchatka, Russia
AU - Pekov, Igor V.
AU - Agakhanov, Atali A.
AU - Koshlyakova, Natalia N.
AU - Zubkova, Natalia V.
AU - Yapaskurt, Vasiliy O.
AU - Britvin, Sergey N.
AU - Vigasina, Marina F.
AU - Turchkova, Anna G.
AU - Nazarova, Maria A.
PY - 2023/10/7
Y1 - 2023/10/7
N2 - The new mineral bakakinite, ideally Ca 2 V 2 O 7 , was found in the high-temperature (not lower than 500°C) exhalations of the Arsenatnaya fumarole at the Second scoria cone of the Northern Breakthrough of the Great Tolbachik Fissure Eruption, Tolbachik volcano, Kamchatka, Russia. It is associated with anhydrite, svabite, pliniusite, schäferite, berzeliite, diopside, hematite, powellite, baryte, fluorapatite, calciojohillerite, ludwigite, magnesioferrite, anorthite, titanite and esseneite. Bakakinite forms flattened crystals up to 30 × 5 μm, typically distorted. The mineral is transparent, colourless or pale yellow, with strong vitreous lustre. Electron microprobe analysis gave (wt.%): CaO 37.04, SrO 0.26, SiO 2 0.16, P 2 O 5 1.48, V 2 O 5 49.47, As 2 O 5 10.85, SO 3 0.35, total 99.61. The empirical formula calculated on the basis of 7 O apfu is (Ca 1.99 Sr 0.01 ) Σ2.00 (V 1.64 As 0.28 P 0.06 Si 0.01 S 0.01 ) Σ2.00 O 7 . The D calc is 3.463 g cm –3 . Bakakinite is triclinic, P $\bar{1}$ , unit-cell parameters are: a = 6.64(2), b = 6.92(2), c = 7.01(2) Å, α = 86.59(7), β = 63.77(7), γ = 83.47(6)°, V = 287.0(5) Å 3 and Z = 2. The strongest reflections of the powder X-ray diffraction pattern [ d ,Å( I )( hkl )] are: 4.647(27)(111, 0 $\bar{1}$ 1), 3.138(76)(002), 3.103(100)(120, 121), 3.027(20)(021), 2.960(81)(200), 2.158(19)(031, 302), 1.791(16)(320), 1.682(16)(114) and 1.584(17)(1 $\bar{3}$ 3, 403). Bakakinite is a natural analogue of synthetic Ca 2 V 2 O 7 . The mineral is named in honour of the outstanding Russian crystallographer and crystal chemist Vladimir Vasilievich Bakakin (born 1933).
AB - The new mineral bakakinite, ideally Ca 2 V 2 O 7 , was found in the high-temperature (not lower than 500°C) exhalations of the Arsenatnaya fumarole at the Second scoria cone of the Northern Breakthrough of the Great Tolbachik Fissure Eruption, Tolbachik volcano, Kamchatka, Russia. It is associated with anhydrite, svabite, pliniusite, schäferite, berzeliite, diopside, hematite, powellite, baryte, fluorapatite, calciojohillerite, ludwigite, magnesioferrite, anorthite, titanite and esseneite. Bakakinite forms flattened crystals up to 30 × 5 μm, typically distorted. The mineral is transparent, colourless or pale yellow, with strong vitreous lustre. Electron microprobe analysis gave (wt.%): CaO 37.04, SrO 0.26, SiO 2 0.16, P 2 O 5 1.48, V 2 O 5 49.47, As 2 O 5 10.85, SO 3 0.35, total 99.61. The empirical formula calculated on the basis of 7 O apfu is (Ca 1.99 Sr 0.01 ) Σ2.00 (V 1.64 As 0.28 P 0.06 Si 0.01 S 0.01 ) Σ2.00 O 7 . The D calc is 3.463 g cm –3 . Bakakinite is triclinic, P $\bar{1}$ , unit-cell parameters are: a = 6.64(2), b = 6.92(2), c = 7.01(2) Å, α = 86.59(7), β = 63.77(7), γ = 83.47(6)°, V = 287.0(5) Å 3 and Z = 2. The strongest reflections of the powder X-ray diffraction pattern [ d ,Å( I )( hkl )] are: 4.647(27)(111, 0 $\bar{1}$ 1), 3.138(76)(002), 3.103(100)(120, 121), 3.027(20)(021), 2.960(81)(200), 2.158(19)(031, 302), 1.791(16)(320), 1.682(16)(114) and 1.584(17)(1 $\bar{3}$ 3, 403). Bakakinite is a natural analogue of synthetic Ca 2 V 2 O 7 . The mineral is named in honour of the outstanding Russian crystallographer and crystal chemist Vladimir Vasilievich Bakakin (born 1933).
UR - https://www.mendeley.com/catalogue/5dad793e-095d-375f-b584-a5ba2be07ab9/
U2 - 10.1180/mgm.2023.42
DO - 10.1180/mgm.2023.42
M3 - Article
VL - 87
SP - 695
EP - 701
JO - Mineralogical Magazine
JF - Mineralogical Magazine
SN - 0026-461X
IS - 5
ER -
ID: 105845348