No. Muscovite is one of the most common minerals. It does usually occurs in LCT pegmatites, yes, but usually at relatively low concentrations (<5%).
They could use a LIBS to instantly test the "pale green feldspars" for lithium. They could also use an XRF to instantly confirm the K/Rb ratio which would immediately give them an understanding of whether the geochem of the pegmatite is fractionated.
Good thickness pegmatite, hopefully they can back it up with good geochem.....
Ann: Multiple Stacked Pegmatites to 55m Intersected At Cobra, page-19
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