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Mineralogical ClassificationCHISTYAKOVAITE (IMA 2005-003) Published

28th Oct 2006 13:37 UTCLuc Vandenberghe Expert

CHISTYAKOVAITE-(Y)*

N.V. Chukanov, G.A. Sidorenko, I.S. Naumova, A.E. Zadov,

V.I. Kuz’min (2006) Chistyakovaite, a new mineral Al(UO2)2

(AsO4)2(F,OH)•6.5H2O. Dokl. Earth Sci., 407, 290–293 (in

English); Dokl. Akad. Nauk, 406, 816–819 (in Russian).

The new species chistyakovaite occurs in samples collected

in the 1950s from the supergene zone of the Bota-Burum deposit,

south of Alakol’ Lake, southwestern Balkhash area, Zhambyl

(Dzhambul) Region, Kazakhstan. This hydrothermal U deposit

consists of carbonatized felsite porphyries and tuffaceous breccias

of Devonian age that have undergone primary hydrothermal

alteration and subsequent supergene alteration. In particular, supergene

alteration of hydrothermal arsenopyrite and pitchblende

is responsible for liberating the U and As responsible for the

new species and many other uranyl-bearing arsenates found at

the deposit. The mineral is associated with arsenopyrite, pyrite,

galena, scorodite, arseniosiderite, mansÞeldite, metazeunerite,

trögerite, and sodium uranospinite. It forms imperfect, {100}

ßattened, yellow crystals to 2 mm across, which are sometimes

intergrown. Brittle; Mohs’hardness 2.5; Dmeas 3.62(2), Dcalc 3.585

g/cm3 ; perfect {100} and imperfect {001} cleavage; stepped

fracture. Bright green luminescence in UV light (365 nm). Optically biaxial (–), colorless, with α = 1.557(2), β = 1.580(1), γ =

1.580(1), 2V = –10(5)°, X = a, Z ≈ b, no dispersion. Dissolves

in HCl at room temperature with no liberated gas. The infrared

spectrum (KBr pellet, 400 to 4000 cm

–1

range) records vibration

and/or ßexing bands for H2O, OH, PO4, UO2, AsO4, and AlO6;

a large shoulder at 3130 cm

–1

implies the existence of some

strong hydrogen bonding. Heating in Ar to 850 °C gives a total

weight loss of 12.2%. This, combined with electron microprobe

analysis (20 kV, 10 nA, 50 μm, except for F at 15 kV, 70 nA,

50–60 μm beam) gave: Al2O3 4.99, UO3 58.34, As2O5 21.40, P2O5

1.23, F 1.1, H2O 12.2, O=F –0.46, total 98.80 wt%, yielding the

empirical formula (per 2 AsO4 + PO4), Al0.96(UO2)2.00<(AsO4)1.83

(PO4)0.17>•6.50H2O, or ideally Al(UO2)2(AsO4)2(F,

OH)•6.50H2O. Gladstone-Dale compatibility is good. Fracturing

and mosaic structure precluded single-crystal study, but powder

X-ray diffraction study gave space groups P2/m, P2 or Pm, a =

19.99(1), b = 9.79(1), c = 19.62(2) Å, β = 110.7(2) °, Z = 8. The

mineral, which would seem to be the arsenate-ßuorine analog

of threadgoldite, has also possibly been found at the Menzenschwand

deposit in the Schwarzwald, Germany. Chistyakovite is

named for N.I. Chistyakova, a senior assistant at the All-Russia

Research Institute of Mineral Resources (VIMS). Type samples

are in the E.V. Kopchenova collection of the Mineralogical Museum

at VIMS, (no. 350/59), and in the Fersman Mineralogical

Museum, Moscow (no. 3286/1).

Discussion. No mention is made of whether peak shape

corrections were applied to the FKα microprobe data. Errors

as large as 20% rel. can be incurred without such corrections

(Solberg, T.N., 1982, Microbeam Analysis, 17, 148–150), an

important concern when the (F,OH) site contains only 0.57 F

apfu.

29th Oct 2006 13:48 UTCPeter Haas

Data page updated.
 
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