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Metamorphic Rocks (Contact Rocks (Metaquartzite- medium grained, fused…
Metamorphic Rocks
Contact Rocks
Metaquartzite- medium grained, fused quartz crystals, granoblastic, crystalline, high grade m. of sandstone
Marble- medium grains, fused calcite crystals, granoblastic, crystalline, high grade m. of limestone
Hornfels- coarse grained, total crystallisation, contains: Andelucite, Quartz, Cordierite and Biotite
Spotted Shale- fine grained, porphyroblasts, random orientation, partial crystallisation, contains: clay, silt, chiastolite andelucite and andelucite
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Regional Rocks
Slate- crystalline, low grade, slaty cleavage, granoblastic, dark grey
Schist- Schistosity foliation, medium grade, augen, porphyroblasts, medium grained
Gneiss- Gneissose foliation, coarse grained, high grade, mono-mineralic banding
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