(Vyacheslavite U4+(PO4)(OH).nH2O - a new uranium phosphate.

Vyacheslavite is found in the zone of secondary enrichment of a U deposit and occurs in veinlets as dense green aggregates on quartz crystals; SEM shows elongated lamellar crystals = or <8 mu m long. Under the microscope the crystals are weakly pleochroic in shades of green and have alpha 1.700, beta 1.726-1.729, gamma 1.729-1.731, 2Valpha small; parallel extinction; electron microdiffraction indicates orthorhombic symmetry. Indexed XRD powder data are tabulated; strongest lines 6.19(10), 2.69(7), 4.56(6), 4.13(6), 3.68(5), 2.71(5) A; a 6.96, b 9.10 c = or < 12.38 A; space group CmCm, Cmc21 or C2cm; Dcalc 5.09/cm3. Microprobe analysis gave UO2 69.75-67.63, CaO 0.5-0.55, P2O5 16.9-17.1, H2O (by diff.) 12.85-14.72, corresponding with the formula U4+(PO4)(OH).nH2O where n approx 2.5. The name is for Vyacheslava G. Melkova.-R.A.H.

Authors
Belova I.N. 1 , Gorshkov A.I. 1 , Ivanova O.A. 1 , Sivtsov A.V. 1 , Lizorkina L.I. 1 , Boronikhin V.A. 1
Journal
Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva
Number of issue
3
Language
Russian
Pages
360-365
Status
Published
Link
External link
Volume
113
Year
1984
Organizations
  • 1 Inst. Geol. Rudn. Mestorozhden. Petrogr., Mineralog., Geokhimiya, Moscow, USSR.
Date of creation
19.10.2018
Date of change
19.10.2018
Short link
https://repository.rudn.ru/en/records/article/record/1403/
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(A CANNIZZARITE HOMOLOGICAL SERIES.

Article
Mozgova N.N., Organova N.I., Kuz'mina O.V., Borodaev Y.S., Laputina I.P., Sivtsov A.V.
Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva. Vol. 113. 1984. P. 657-672