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The grain structure of the South African chromite has a rhombohedral grain shape, which is formed when the mineral is crushed during the mining operation. Earlier microscope observations by Piperno had uncovered characteristic grain shapes for these and many other modern species of wild and domesticated plants. While traditional grain shapes are "blocky" and do not cut with optimum aggressiveness, this latest generation of sharper ceramic grains presents keener cutting edges to the work piece. |
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