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Mineralogical ClassificationStructure of unnamed natural FeCrO3

2nd Oct 2015 15:46 UTCUwe Kolitsch Manager

M. A. Pérez-Cruz, M. P. Elizalde-González, R. Escudero, S. Bernès, R. Silva-González and Y. Reyes-Ortega (2015): At last! The single-crystal X-ray structure of a naturally occurring sample of the ilmenite-type oxide FeCrO3. Acta Crystallogr. B71, 555-561.


Synopsis: The crystal structure of the new mineral FeCrO3 has been determined. The single crystal studied belongs to the space group R-3 and the structure refinement shows an ordered cation distribution, consistent with the ilmenite structural type.

Abstract: A natural single crystal of the ferrimagnetic oxide FeCrO3, which was found in an opencast mine situated in the San Luis Potosí State in Mexico, has been characterized in order to elucidate some outstanding issues about the actual structure of this material. The single-crystal X-ray analysis unambiguously shows that transition metal cations are segregated in alternating layers normal to the threefold crystallographic axis, affording a structure isomorphous to that of ilmenite (FeTiO3), in the space group R-3. The possible occurrence of cation antisite and vacancy defects is below the limit of detection available from X-ray data. Structural and magnetic results are in agreement with the coherent slow intergrowth of magnetic phases provided by the two antiferromagnetic corundum-type parent oxides Fe2O3 (hematite) and Cr2O3 (eskolaite). Our results are consistent with the most recent density functional theory (DFT) studies carried out on digital FeCrO3 [Sadat Nabi & Pentcheva (2011). Phys. Rev. B, 83, 214424], and suggest that synthetic samples of FeCrO3 might present a cation distribution different to that of the ilmenite structural type.


_cell_length_a 5.0770(4)

_cell_length_c 13.9621(14)

_cell_volume 311.67(6)


Added.

I will check the ref. for the specific mine.

3rd Oct 2015 14:51 UTCUwe Kolitsch Manager

"Crystals were found in a clinoptilolite tuff known as Mexican TAM-2, extracted in the opencast mines located in Villa de Reyes (21°48’ N 100°56’ W), in the Zona Centro of San Luis Potosí State, Mexico."


Updated.
 
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