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"TWINING <br /> CONCRETE INSIGHT <br /> Morrison Quarry Phase II Rock Petrography Page 18 <br /> - � <br /> j <br /> Tr - <br /> f <br /> (a) <br /> / <br /> f / <br /> A rr ,r <br /> (b) <br /> Figure 4.2f. Sample 3. Transmitted light photomicrograph of thin section showing detail of rock in (a) plane- <br /> polarized and (b) cross-polarized light. Pink arrows indicate elongated mineral grains that display 1st order <br /> to high 2nd order birefringence colors consistent with kaolinite and/or talc. <br /> Report No. 237923.d 20 February 2023 <br />