New arsenate minerals from the Arsenatnaya fumarole, Tolbachik volcano, Kamchatka, Russia. XIV. Badalovite, NaNaMg(MgFe3+)(AsO4)3, a member of the alluaudite group

Belakovskiy

et al. 2022

Self Cite

The new alluaudite-group mineral khrenovite with the ideal, end-member formula Na3Fe 3+ 2(AsO4)3 was found in the Arsenatnaya fumarole, Second scoria cone of the Northern Breakthrough of the Great Tolbachik Fissure Eruption, Tolbachik volcano, Kamchatka, Russia. It is associated with aphthitalite-group sulfates, badalovite, calciojohillerite, nickenichite, johillerite, tilasite, svabite, achyrophanite, ozerovaite, pansnerite, arsenatrotitanite, anhydrite, sanidine, hematite, cassiterite, rutile, and pseudobrookite. Khrenovite occurs as coarse prismatic crystals up to 0.2 × 0.3 × 0.8 mm 3 and their clusters up to 1 mm across. It is transparent, honey-coloured, red-, orange-or yellowbrown, with vitreous lustre. Khrenovite is brittle, cleavage was not observed. Dcalc is 4.257 g cm -3 . Khrenovite is optically biaxial (+), α = 1.825(7), β = 1.834(7), γ = 1.845(7), 2Vmeas. = 80(10)º. The

Section: X-ray Crystallography and Crystal Structure Determinationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

New arsenate minerals from the Arsenatnaya fumarole, Tolbachik volcano, Kamchatka, Russia. XVIII. Khrenovite, Na₃Fe³⁺₂(AsO₄)₃, the member with the highest sodium in the alluaudite supergroup

Belakovskiy

et al. 2022

Self Cite

“…In this paper, we continue the characterisation of new arsenate mineral species found in the Arsenatnaya fumarole located at the apical part of the Second scoria cone of the Northern Breakthrough of the Great Tolbachik Fissure Eruption 1975–1976, Tolbachik volcano, Kamchatka Peninsula, Far-Eastern Region, Russia (55°41′N, 160°14′E, 1200 m a.s.l.). Nineteen new minerals have been described in the previous articles of this series: yurmarinite Na 7 (Fe 3+ ,Mg,Cu) 4 (AsO 4 ) 6 (Pekov et al , 2014a), two polymorphs of Cu 4 O(AsO 4 ) 2 , ericlaxmanite and kozyrevskite (Pekov et al , 2014b), popovite Cu 5 O 2 (AsO 4 ) 2 (Pekov et al , 2015a), structurally related shchurovskyite K 2 CaCu 6 O 2 (AsO 4 ) 4 and dmisokolovite K 3 Cu 5 AlO 2 (AsO 4 ) 4 (Pekov et al , 2015b), katiarsite KTiO(AsO 4 ) (Pekov et al , 2016a), melanarsite K 3 Cu 7 Fe 3+ O 4 (AsO 4 ) 4 (Pekov et al , 2016b), pharmazincite KZnAsO 4 (Pekov et al , 2017), arsenowagnerite Mg 2 (AsO 4 )F (Pekov et al , 2018c), arsenatrotitanite NaTiO(AsO 4 ) (Pekov et al , 2019a), the two isostructural minerals edtollite K 2 NaCu 5 Fe 3+ O 2 (AsO 4 ) 4 and alumoedtollite K 2 NaCu 5 AlO 2 (AsO 4 ) 4 (Pekov et al , 2019b), anatolyite Na 6 (Ca,Na)(Mg,Fe 3+ ) 3 Al(AsO 4 ) 6 (Pekov et al , 2019c), zubkovaite Ca 3 Cu 3 (AsO 4 ) 4 (Pekov et al , 2019d), pansnerite K 3 Na 3 Fe 3+ 6 (AsO 4 ) 8 (Pekov et al , 2020a), badalovite NaNaMg(MgFe 3+ )(AsO 4 ) 3 (Pekov et al , 2020b), calciojohillerite NaCaMgMg 2 (AsO 4 ) 3 (Pekov et al , 2021a), and yurgensonite K 2 SnTiO 2 (AsO 4 ) 2 (Pekov et al , 2021b).…”

Section: Introductionmentioning

confidence: 99%

New arsenate minerals from the Arsenatnaya fumarole, Tolbachik volcano, Kamchatka, Russia. XVII. Paraberzeliite, NaCaCaMg₂(AsO₄)₃, an alluaudite-group member dimorphous with berzeliite

Belakovskiy

et al. 2022

Self Cite

The new alluaudite-group mineral parabezeliite was found in the Arsenatnaya fumarole, Second scoria cone of the Northern Breakthrough of the Great Tolbachik Fissure Eruption, Tolbachik volcano, Kamchatka, Russia. In the deepest zone of Arsenatnaya, paraberzeliite (holotype) is accociated with anhydrite, diopside, hematite, svabite, berzeliite, schäferite, calciojohillerite, magnesioferrite, ludwigite, fluorapatite, powellite, baryte, and rhabdoborite-group and aphthitalitegroup members. In the middle zone of the fumarole, paraberzeliite occurs with hematite, calciojohillerite, badalovite, johillerite, nickenichite, tilasite, svabite, fluorophlogopite, sanidine, cassiterite, anhydrite, metathénardite and belomarinaite. Paraberzeliite forms prismatic crystals up to 0.2 × 0.2 × 1 mm 3 often occurring in open-work aggregates. It is transparent, brown (from light to dark brown, sometimes with purple or red hue) or green (from pale greenish to yellow-green).The mineral is brittle, cleavage was not observed. The Mohs hardness is 3½. D calc is 3.811 g cm -3 .Paraberzeliite is optically biaxial (+), α = 1.718(4), β = 1.728(4), γ = 1.742(4), 2V meas. = 85( 5)º. The chemical composition (wt.%, electron-microprobe; holotype) is: Na 2 O 6.43, CaO 16.65, MgO 11.64, MnO 1.65, CuO 0.06, Fe 2 O 3 2.45, V 2 O 5 1.10, As 2 O 5 59.46, total 99.44. The calculated empirical formula based on 12 O atoms per formula unit is (Na 1.20 Ca 1.71 Mg 1.66 Mn 0.13 Fe 3+ 0.18 ) Σ4.88 (As 2.98 V 0.07 ) Σ3.05 O 12 . Paraberzeliite is monoclinic, C2/c, a = 12.3143( 7), b = 13.0679( 5), c = 6.7717(4) Å, β = 113.657(7)º, V = 998.14(10) Å 3 and Z = 4. The crystal structure was solved from single-crystal X-ray diffraction data, R = 0.0349. Paraberzeliite is isostructural with other alluaudite-group minerals. Its simplified crystal chemical formula is A(1) Ca A(2)' Na M(1) Ca M(2) Mg 2 ( T AsO 4 ) 3 . The idealized formula is NaCa 2 Mg 2 (AsO 4 ) 3 , or, according to the actual nomenclature of alluaudite-group arsenates, NaCaCaMg 2 (AsO 4 ) 3 . The name paraberzeliite reflects the dimorphism of this alluaudite-group mineral with the arsenate garnet berzeliite, ideally (Ca 2 Na)Mg 2 (AsO 4 ) 3 .

“…One of the outstanding features of this fumarole is the abundance of new arsenate minerals (Pekov et al , 2018a). Seventeen new species were characterised in the previous articles of this series, namely yurmarinite Na 7 (Fe 3+ ,Mg,Cu) 4 (AsO 4 ) 6 (Pekov et al , 2014a), two polymorphs of Cu 4 O(AsO 4 ) 2 , ericlaxmanite and kozyrevskite (Pekov et al , 2014b), popovite Cu 5 O 2 (AsO 4 ) 2 (Pekov et al , 2015a), structurally related shchurovskyite K 2 CaCu 6 O 2 (AsO 4 ) 4 and dmisokolovite K 3 Cu 5 AlO 2 (AsO 4 ) 4 (Pekov et al , 2015b), katiarsite KTiO(AsO 4 ) (Pekov et al , 2016a), melanarsite K 3 Cu 7 Fe 3+ O 4 (AsO 4 ) 4 (Pekov et al , 2016b), pharmazincite KZnAsO 4 (Pekov et al , 2017), arsenowagnerite Mg 2 (AsO 4 )F (Pekov et al , 2018b), arsenatrotitanite NaTiO(AsO 4 ) (Pekov et al , 2019a), the two isostructural minerals edtollite K 2 NaCu 5 Fe 3+ O 2 (AsO 4 ) 4 and alumoedtollite K 2 NaCu 5 AlO 2 (AsO 4 ) 4 (Pekov et al , 2019b), anatolyite Na 6 (Ca,Na)(Mg,Fe 3+ ) 3 Al(AsO 4 ) 6 (Pekov et al , 2019c), zubkovaite Ca 3 Cu 3 (AsO 4 ) 4 (Pekov et al , 2019d), pansnerite K 3 Na 3 Fe 3+ 6 (AsO 4 ) 8 (Pekov et al , 2020a) and badalovite NaNaMg(MgFe 3+ )(AsO 4 ) 3 (Pekov et al , 2020b). The latter belongs to the alluaudite group, a subdivision of the alluaudite supergroup, as well as the new mineral calciojohillerite described in the present paper.…”

Section: Introductionmentioning

confidence: 99%

New arsenate minerals from the Arsenatnaya fumarole, Tolbachik volcano, Kamchatka, Russia. XV. Calciojohillerite, NaCaMgMg₂(AsO₄)₃, a member of the alluaudite group

Agakhanov

et al. 2021

Self Cite

The new alluaudite-group mineral calciojohillerite is one of the major arsenates in sublimates of the Arsenatnaya fumarole at the Second scoria cone of the Northern Breakthrough of the Great Tolbachik Fissure Eruption, Tolbachik volcano, Kamchatka, Russia. In middle zones of the fumarole, calciojohillerite is associated with hematite, tenorite, johillerite, nickenichite, bradaczekite, badalovite, tilasite, lammerite, ericlaxmanite, aphthitalite-group sulfates, langbeinite, calciolangbeinite, anhydrite, sanidine, fluorophlogopite, fluoborite, cassiterite, pseudobrookite, rutile, sylvite and halite. In deep zones it occurs in association with anhydrite, diopside, hematite, svabite, berzeliite, schäferite, forsterite, magnesioferrite, ludwigite, rhabdoborite-group fluoroborates, powellite, baryte, fluorapatite, udinaite, arsenudinaite and paraberzeliite. Calciojohillerite forms prismatic crystals up to 1 cm long, their aggregates and crystal crusts up to 0.5 m2. It is transparent, colourless, pale green, pale yellow, light blue, pale lilac or pink, with vitreous lustre. The mineral is brittle, with imperfect cleavage. The Mohs hardness is 3½. Dcalc is 3.915 g cm–3. Calciojohillerite is optically biaxial (–), α = 1.719(3), β = γ = 1.732(3); 2Vmeas. = 15(10)°. Chemical composition (wt.%, electron-microprobe; holotype) is: Na2O 7.32, K2O 0.10, CaO 6.82, MgO 20.31, MnO 0.68, CuO 0.27, ZnO 0.02, Al2O3 0.56, Fe2O3 3.53, TiO2 0.01, SiO2 0.03, P2O5 1.25, V2O5 0.10, As2O5 58.77, SO3 0.13, total 99.90. The empirical formula based on 12 O atoms is (Na1.30K0.01Ca0.67Mg2.78Mn0.05Cu0.02Al0.06Fe3+0.24)Σ5.13(As2.83P0.10S0.01V0.01)Σ2.95O12. Calciojohillerite is monoclinic, C2/c, a = 11.8405(3), b = 12.7836(2), c = 6.69165(16) Å, β = 112.425(3)°, V = 936.29(4) Å3 and Z = 4. The crystal structure was solved from single-crystal X-ray diffraction data, R1 = 0.0227. Calciojohillerite is isostructural with other alluaudite-group minerals. Its simplified crystal chemical formula is A (1)Ca A (1)′□ A (2)□ A (2)′Na M (1)Mg M (2)Mg2(AsO4)3 (□ = vacancy). The idealised formula is NaCaMg3(AsO4)3, or, according to the nomenclature of alluaudite-group arsenates, NaCaMgMg2(AsO4)3. Calciojohillerite is named as an analogue of johillerite NaCu2+MgMg2(AsO4)3 with species-defining Ca instead of Cu in the ideal formula.