Particle Shape

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subhedral
definition Crystalline particles in a rock are partly bounded by crystal faces, usually referring to igneous or metamorphic grains more like this
source MacKenzie, W.S., Donaldson, C.H. & Guilford, C., 1982. Atlas of igneous rocks and their textures. John Wiley & Sons, New York more like this
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subhedral
very angular
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very angular
definition A clastic sedimentary particle with a roundness value between 0.12 and 0.17 (midpoint at 0.14). more like this
source Powers, M. C., 1953 A new roundness scale for sedimentary particles. Journal of Sedimentary Petrology, v. 23, p. 117-119 more like this
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in scheme particleshape
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