Donathite discredited

Autor(en)

Peter Carman Burns, Frank C: Hawthorne, Eugen Libowitzky, N. Bordes, Rodney Charles Ewing

Abstrakt

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(en)

Institut für Mineralogie und Kristallographie

Externe Organisation(en)

University of Manitoba, University of Notre Dame, University of Michigan

Journal

Neues Jahrbuch für Mineralogie. Monatshefte

Seiten

163-174

Anzahl der Seiten

12

ISSN

0028-3649

Publikationsdatum

1997

ÖFOS 2012

105116 Mineralogie, 105113 Kristallographie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/donathite-discredited(994cf159-c244-46ab-a7b3-a838197b6875).html