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Mineralogical Magazine; February 1998; v. 62; no. 1; p. 113-119
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Manganese valency and the colour of the Mn 2 AsO 4 (OH) polymorphs eveite and sarkinite

Ulf Halenius, and Erika Westlund

Swedish Museum of Natural History, Department of Mineralogy, Stockholm, Sweden
Stockholm University, Sweden

Polarized optical absorption spectra of single crystals of the two dimorphic Mn 2 AsO 4 (OH)-minerals eveite and sarkinite show that minor concentrations of Mn (super 3+) at the octahedral site determine the colour and cause the distinct pleochroism in green and yellow of eveite. In the sarkinite spectra only absorption bands due to spin-forbidden d-d transitions in Mn (super 2+) at six-and five-coordinated sites are observed, which produce a weak flesh-red mineral colour and a very faint pleochroism.

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