IMA 2017-002 = batagayite

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Marco E. Ciriotti
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IMA 2017-002 = batagayite

Messaggio da Marco E. Ciriotti » gio 14 dic, 2017 18:49

Prossima pubblicazione.

Referenza:
▪ Yakovenchuk, V.N., Pakhomovsky, Ya.A., Konopleva, N.G., Panikorovskii, T.L., Bazai, A., Mikhailova, J.A., Bocharov, V.N., Ivanyuk, G.Yu., Krivovichev, S.V. (2018): Batagayite, CaZn2(Zn,Cu)6(PO4)4(PO3OH)3·12H2O, a new phosphate mineral from Këster tin deposit (Yakutia, Russia): occurrence and crystal structure. Mineralogy and Petrology, 112, (in press).

Abstract:
Batagayite, CaZn2(Zn,Cu)6(PO4)4(PO3OH)3·12H2O, is a new secondary phosphate mineral from the Këster deposit, Arga-Ynnykh-Khai massif, NE Yakutia, Russia. It is monoclinic, P21, a = 8.4264(4), b = 12.8309(6), c = 14.6928(9) Å, β = 98.514(6)o, V = 1571.05(15) Å3 and Z = 2 (from single-crystal X-ray diffraction data). Batagayite crystals are blades up to 2 mm long, flattened on {001} and elongated on [100]; blades often grow in radial aggregates. Associated minerals are arsenolite, native copper, epifanovite, fluorapatite, libethenite, Na-analogue of batagayite, pseudomalachite, quartz, sampleite, tobermorite, and Mg-analogue of hopeite. The streak is white and the luster is vitreous. The mineral is brittle and has a perfect cleavage on {001}, no parting was observed. The Mohs hardness is 3. Density, determined by the float-sink method in Clerici solution, is 2.90(3) g/cm3, and the calculated density is 3.02 g/cm3 (using the empirical formula and single-crystal unit-cell parameters). Batagayite is biaxial, optically negative, α = 1.566 ± 0.002, β = 1.572 ± 0.002, γ = 1.573 ± 0.002 at 589 nm. 2Vmeas. = 40(5)°, 2Vcalc = 44.3°. Optical orientation: Z is perpendicular to (001), further details unclear. No dispersion or pleochroism were observed. The mean chemical composition determined by electron microprobe is: Na2O 0.31, MgO 1.39, Al2O3 0.55, SiO2 0.48, P2O5 34.37, K2O 0.17, CaO 2.76, MnO 1.03, CuO 5.80, ZnO 35.62, CdO 0.24 wt%. The H2O content estimated from the crystal-structure refinement is 16.83 wt%, giving a total of 99.55 wt%. The empirical formula calculated on the basis of P + Si = 7 is (Zn6.22Cu1.04Ca0.70Mg0.49Mn0.21Al0.15Na0.14K0.05Cd0.03)Σ9.03(P6.89Si0.11)Σ7.00O24.91(OH)3.09·12.10H2O. The mineral easily dissolves in 10% room-temperature HCl. The eight diagnostic lines in the X-ray powder-diffraction pattern are (I-d[Å]-hkl): 100-14.59-001, 25-6.34-012, 11-6.02-111, 37-4.864-003, 13-4.766-112, 20-3.102-1 2 ¯ ¯ ¯ 4 ¯ ¯ ¯ 2¯4¯, 11-2.678-2 3 ¯ ¯ ¯ 3 ¯ ¯ ¯ 3¯3¯, 16-2.411-044. The crystal structure of batagayite was solved by direct methods and refined to R1 = 0.069 for 3847 independent reflections with Fo > 4σ(Fo). It is based upon complex heteropolyhedral [M8(PO4)4(PO3OH)3(H2O)9]2− layers parallel to the (001) plane. The layer can be considered as consisting of three sublayers, one A and two B. The central A layer has the composition [M4(PO4)4(H2O)4]4− and consists of the zigzag chains of edge-sharing (MO6) octahedra running parallel to the a axis and linked into layers by sharing peripheral O atoms. The (PO4) tetrahedra are attached above and below the holes created by the linkage of zigzag octahedral chains. The B sublayer consists of chains of (ZnO4) and (PO3OH) tetrahedra. The interlayer space is occupied by the Ca2+ cations and H2O molecules. Batagayite is a secondary low-temperature mineral formed as a result of alteration of primary minerals such as native copper and fluorapatite. On the basis of its structural complexity calculated as 1058.257 bits/cell (taking into account contributions from H atoms), batagayite should be considered as a very complex mineral. The high complexity of batagayite is due to its high hydration state and the modular character of its structure, which contains both octahedral-tetrahedral layers and tetrahedral chains.
Marco E. Ciriotti

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Marco E. Ciriotti
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Re: IMA 2017-002 = batagayite

Messaggio da Marco E. Ciriotti » mar 19 dic, 2017 12:42

Angarfite NaFe3+5(PO4)4(OH)4·4H2O C2221 12.800 17.908 8.211 1882.2 90
Bakhchisaraitsevite Na2Mg5(PO4)4·7H2O P21/c 8.309 12.906 17.486 1834.0 102.0
Batagayite CaZn2(Zn,Cu)6(PO4)4(PO3OH)3·12H2O P21 8.426 12.831 14.693 1571.1 98.5
Castellaroite Mn2+3(AsO4)2·4.5H2O P21/n 8.757 13.468 18.652 2191.7 94.9
Ludlamite Fe2+3(PO4)2·4H2O mon P21/a 10.541 4.646 9.324 90.00 100.43 90.00
Mejillonesite NaMg2(PO3OH)(PO4)(OH)·H5O2 Pbca 16.295 13.009 8.434 1787.9 90
Metaswitzerite Mn3(PO4)2·4H2O P21/c 8.496 13.173 17.214 1913.6 96.7
Rimkorolgite BaMg5(PO4)4·8H2O P21/c 8.335 12.830 18.313 1958.5 90.0
Sterlinghillite(?) Mn2+3(AsO4)2·3H2O (!) 12.39 11.23 11.62 90.00 98.45 90.00
Switzerite Mn3(PO4)2·7H2O P21/a 8.528 13.166 11.812 1245.9 110.1

Come si vede qui sopra la batagayite ha affinità strutturali con la castellaroite e le altre specie elencate, tutte con [M(TO4)ϕ] layers.
Marco E. Ciriotti

«Things are interesting only in so far as they relate themselves to other things»

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Marco E. Ciriotti
Messaggi: 24842
Iscritto il: ven 25 giu, 2004 11:31
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Re: IMA 2017-002 = batagayite

Messaggio da Marco E. Ciriotti » ven 03 ago, 2018 15:05

Pubblicazione effettuata.

Referenza:
▪ Yakovenchuk, V.N., Pakhomovsky, Ya.A., Konopleva, N.G., Panikorovskii, T.L., Bazai, A., Mikhailova, J.A., Bocharov, V.N., Ivanyuk, G.Yu., Krivovichev, S.V. (2018): Batagayite, CaZn2(Zn,Cu)6(PO4)4(PO3OH)3·12H2O, a new phosphate mineral from Këster tin deposit (Yakutia, Russia): occurrence and crystal structure. Mineralogy and Petrology, 112, 591-601.
Marco E. Ciriotti

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