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"TWINING <br /> CONCRETE INSIGHT <br /> Morrison Quarry Phase II Rock Petrography Page 17 <br /> rr <br /> oe <br /> I <br /> e <br /> (b) <br /> Figure 4.2e. Sample 3. Transmitted light photomicrograph of thin section showing detail of rock in (a) plane- <br /> polarized and (b) cross-polarized light. Red arrow indicates quartz. Blue arrow indicates muscovite grain. <br /> Pink arrows indicate mineral grains that display 1st order to high 2nd order birefringence colors consistent <br /> with kaolinite and/or talc. <br /> Report No. 237923.d 20 February 2023 <br />