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"TWINING <br /> CONCRETE INSIGHT <br /> Morrison Quarry Phase II Rock Petrography Page 15 <br /> 000 pm <br /> (a) <br /> �r <br /> (b) <br /> Figure 4.2d. Sample 3. (a)Reflected light photomicrograph showing detail of the polished surface. Red arrow <br /> indicates quartz. Blue arrow indicates biotite grain.Pink arrows indicate a soft and friable mineral consistent <br /> with kaolinite and/or talc. (b) Reflected light photomicrograph of the polished surface showing detail of the <br /> soft mineral exhibiting a Mobs hardness of<2. <br /> Report No. 237923.d 20 February 2023 <br />