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Transmission electron microscopy study of gaudefroyite,

Department of Earth and Environmental Sciences, Faculty of Science, University of Kuwait, P.O. Box 5969, Safat, 13060, Kuwait

Correspondence: ^* E-mail: ishmael{at}kuc01.kuniv.edu.kw

A transmission electron microscopy (TEM) study of gaudefroyite, , from the Wessels mine, Kalahari manganese field, South Africa, shows strong, continuous streaking in selected-area electron diffraction (SAED) patterns. The pseudo-hexagonal parameters for gaudefroyite are a = 10.606(1) and c = 5.896(1) Å. The symmetry of gaudefroyite is lower than hexagonal because of the streaked reflections. The CO₃ groups in the large 6₃ channels are ordered in two different ways and this ordering gives rise to two different types of channels, A and B. The A and B channels occur in a 1:1 ratio and these channels are partially ordered and give rise to the continuous streak reflections in gaudefroyite.

This article has been cited by other articles:

				S. M. Antao and I. Hassan GAUDEFROYITE, Ca8Mn3+6[(BO3)6(CO3)2O6]: HIGH-TEMPERATURE CRYSTAL STRUCTURE Can Mineral, February 1, 2008; 46(1): 183 - 193. [Abstract] [Full Text] [PDF]