Submit an Article
Become a reviewer
Vol 170 No 2
Pages:
22-24
Download volume:
RUS
Research article
Geology

Crystal chemistry of synthetic pyromorphite-mimetite solid solutions

Authors:
Marta Strycharczyk
About authors
  • AGH – University of Science and Technology
Date submitted:
2006-08-07
Date accepted:
2006-10-30
Date published:
2007-04-11

Abstract

Pyromorphite Pb 5 [PO 4 ] 3 Cl, mimetite Pb 5 [AsO 4 ] 3 Cl, and their solid solutions were synthesized from aqueous solutions. These minerals form a ternary system within apatite group of Pb 3 /m symmetry (hexagonal bipyramid). Natural pyromorphite usually contains several percent of As. Also, natural mimetite often contains PO 4 substitutions. The objective of this study was determination of regularities in crystalline lattice parameters changes with anionic substitution of AsO 4 -3 and PO 4 -3 . The products were characterized using X-ray diffraction and scanning electron microscopy with micro-analysis. The synthesis yielded a fine white precipitate. X-ray diffraction indicated crystalline character of the precipitate. The lattice parameters for end-members are in accordance with ICDD standards and equal for pyromorphite a=10,009 Å and c=7.338 Å and for mimetite a=10,247Å and c=7,448 Å. Both lattice parameters increase proportionally to the increase of As substitution in pyromorphite in conformation with Vegard’s law.

Go to volume 170

References

  1. Baker W.E., 1966: An X-ray diffraction study of synthetic members of the pyromorphite series. Am. Mineral., 51, 1712-1721.
  2. Denton A.R., Asheroft N.W., 1991: Vegard’s law. Phys. Rev. A, 43, 6, 3161-3164.
  3. Inegbenebor A.I., Thomas J.H., Williams P., 1989: The chemical stability of mimetite and distribution coefficients for pyromorphite-mimetite solid-solutions. Min. Mag., 53, 363-371.
  4. Nakamoto A., Urasima Z., Sugiura S., Nakano H., Yachi T., Tadokoro K., 1969: Pyromorphite-mimetite minerals from the Otaru-Matsukura barite mine in Hokkaido, Japan. Mineral. J., 6, 1-2, 85-101.
  5. Strycharczyk M., Manecki M., Bajda T., Mozgawa W., Gawel A., 2005: Synthesis of pyromorphite-mimetite solid solutions from aqueous solutions — preliminary results. Pol. Tow. Mineral. Prace Spec. 25, 225-228.
  6. Yongshan D., Hughes J.M., 1989: Crystal-structure refinements of vanadynite and pyromorphite. Can. Mineral., 27, 189-192.
  7. Yongshan D., Hughes J.M., Moore P.B., 1991: The crystal structures of mimetite and clinomimetite, Pbs(AsO,)3Cl. Can. Mineral., 29, 369-376.

Similar articles

Nitrification of high ammonia concentrations in membrane bioreactors - microbiological aspect
2007 Anna Raszka, Joanna Surmacz-Górska
Development prospects of Nyurba Mining and Processing Plant
2007 O. A. Nechkina
Application of fractal dimension theory for the estimation of spatial variability of soil parameters
2007 Michał Misciorak, Grzegorz Janik
A new method of investigation of blasting effects on buildings and structures using fiberglass cables
2007 K. Drebenstedt, S. Pessler
Economic evaluation of the effectiveness of investment projects of diamond mining industry
2007 N. V. Smirnova
Development of the displacement sensor on the basis of integral accelerometer for the dynamometer-dynamometer systems for deep well rod pumps
2007 A. F. Sakaev