B-48 Mica-Bearing Pegmatites of GeorgiaPage 1 .. rock types. Inclusions of mica schist and gneiss tend to dip and strike ... hard mica-bearing pegmatites are exposed at the surface. . A mechanical hoist will .. of small mica could be obtained here by crushing and washing the.mechanical hard schist crusher page,Quantitative Classification of Rock Mass - IITKPage 1 . Term. Kg/cm2. Schist, Silt stone. VW-W, Sand. Very Weak- VW. < 70. Stone . Rock hardness (hard, medium, soft, decomposed). • c. Geologic structure.Deformation and strength anisotropy of Asan gneiss, Boryeong .Nov 2, 2018 . Article in International Journal of Rock Mechanics and Mining Sciences .. various rocks such as sandstone, siltstone, shale, gneiss, and schist.
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