Donathite discredited
- Author(s)
- Peter Carman Burns, Frank C: Hawthorne, Eugen Libowitzky, N. Bordes, Rodney Charles Ewing
- Abstract
Donathite from Ramberget (Hestmona), Norway, has been examd. by Rietveld structure refinement, SEM and transmission electron microscopy (TEM). Testing of both single- and multi-phase models by Rietveld structure refinement gave the best fit to the pattern for a mixt. of a cubic spinel (Fd3m, a = 8.3847(2) .ANG., Fe3*O4; Fe* = Fe2+ + Fe3+ + Cr) and a tetragonal spinel (P4122, a = 5.2946(3), c = 8.3144(4), Mg1.74*Fe1.26*O4, Mg* = Mg + Al). These compns. were confirmed qual. by anal. electron microscopy. Leaching donathite results in a boxwork of lamellae of a cubic spinel of compn. (Mg0.53Fe0.432+Ti0.04)(Cr1.18Fe0.433+Al0.31Fe0.082+)O4; the compn. of this residual phase was modified by extensive chem. exchange with the acids used in the dissoln. process. Donathite is a mixt. of two phases, and its discreditation as a valid mineral species has been approved by the International Mineralogical Assocn. Commission on New Minerals and Mineral Names.
- Organisation(s)
- Department of Mineralogy and Crystallography
- External organisation(s)
- University of Manitoba, University of Notre Dame, University of Michigan
- Journal
- Neues Jahrbuch für Mineralogie. Monatshefte
- Pages
- 163-174
- No. of pages
- 12
- ISSN
- 0028-3649
- Publication date
- 1997
- Austrian Fields of Science 2012
- 105116 Mineralogy, 105113 Crystallography
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/donathite-discredited(994cf159-c244-46ab-a7b3-a838197b6875).html