DOI

  • N. V. Zubkova
  • I. V. Pekov
  • N. V. Chukanov
  • A. V. Kasatkin
  • D. A. Ksenofontov
  • V. O. Yapaskurt
  • S. N. Britvin
  • D. Yu Pushcharovsky

The crystal structure of lemanskiite is determined for the first time (R = 0.019) and the mineral is redefined. Its chemical formula, crystal system, space group and unit-cell parameters are revised. The powder X-ray diffraction pattern of lemanskiite has been correctly indexed; the IR spectrum of an impurity-free sample has been obtained. It has been shown that the mineral is not a dimorph of lavendulan NaCaCu 5 (AsO 4 ) 4 Cl · 5H 2 O and differs from the latter by a lower H 2 O content. The studied sample was from the oxidation zone of the Perseverancia deposit, Guanako, Antofagasta, Chile. It empirical formula is Na 0.98 (Ca 0.98 Sr 0.031.01 Cu 5.07 As 3.97 O 15.97 Cl 1.03 · 3H 2 O; the idealized formula is NaCaCu5(AsO4)4Cl · 3H2O. The mineral is monoclinic, P 2 1/m, a = 9.250(2), b = 10.0058(10), с = 10.0412(17) Å, β = 97.37(3)°, V = 921.7(3) Å 3 , Z =2. Lemanskiite represents a new structure type in the lavendulan group. Its structure is based on heteropolyhedral layers composed of clusters consisting of four edge-shared distorted Cu-centered tetragonal pyramids joined with eight AsO 4 tetrahedra, which are also linked with a Cu-centered plane squares not involved in the clusters. Interlayer edge-shared Na-centered trigonal prisms and Ca sevenfold polyhedra are linked with the heteropolyhedral layers from both sides.

Язык оригиналаанглийский
Страницы (с-по)594-606
Число страниц13
ЖурналGeology of Ore Deposits
Том60
Номер выпуска7
DOI
СостояниеОпубликовано - 1 дек 2018

    Предметные области Scopus

  • Геология
  • Геохимия и петрология
  • Экономическая геология

ID: 40648441