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Rubidium- and cesium-dominant micas in granitic pegmatites

Petr ern^1,*, Ron Chapman¹, David K. Teertstra¹ and Milan Novák^1,

Department of Geological Sciences, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada

Correspondence: ^* E-mail: p_cerny{at}umanitoba.ca

The mode of occurrence and chemical composition of five types of micas with Rb- or Cs-dominant populations of interlayer cations, collected from the Red Cross Lake rare-element pegmatites in north-central Manitoba, are described here. All five micas are candidates for new mineral species but crystal-structural data and Li contents could not be determined to date because of extremely small particle size, restricted to the margins of strongly zoned microcrystals. Based on electron-micro-probe analyses, on Li contents estimated from Li/F (at.) = 1.0, and on bulk analysis of ferromagnesian micas for FeO and Fe₂O₃, the micas correspond to Rb- and Cs-dominant polylithionite (with representative interlayer populations of Rb_0.82K_0.12Cs_0.07 and Cs_0.74Rb_0.12K_0.08 apfu, respectively), Rb-and Cs-dominant magnesian annite (Rb₄₅K_0.37Cs_0.20 and Cs_0.67Rb_0.20K_0.12 apfu, respectively), and Cs-dominant ferroan phlogopite (Cs_0.92Rb_0.04K_0.02 apfu).

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