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Polylithionite The lithium mica polylithionite is found in coarse platy masses many cm across. It is generally transparent under the microscope and pale yellow to greenish in aggregate.
Under shortwave ultraviolet, polylithionite fluoresces yellowish-white. The fluorescent intensity varies; when dim the fluorescence may have a greenish cast, when bright it is nearly white. Polylithionite is not noticeably fluorescent under midwave or longwave ultraviolet. Note assertions by some mineral collectors (e.g. Robbins 1983, 1994) that polylithionite fluoresces a “lemon” yellow are grossly inaccurate for Ilímaussaq material: the color is nothing like any lemon.
Polylithionite occurs in various secondary assemblages and can be found with a wide variety of other secondary minerals—some of which also fluoresce—providing for stunning specimens.
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