Texture Grain Size Rock Name Comments Parent Rock Very Fine Slate Excellent rock cleavage, smooth dull suraces Shale mudstone, or siltstone uo-:- Fine Phyllite Breaks along wavey surfaces, glossy...

Texture Grain Size Rock Name Comments Parent Rock Very Fine Slate Excellent rock cleavage, smooth dull suraces Shale mudstone, or siltstone uo-:- Fine Phyllite Breaks along wavey surfaces, glossy sheen Slate COLOUCO EODEOLAC-E Medium to Schist Micas dominate, scaly foliation Phyllite D Coarse Medium to Gnesis Compositional banding due to segration of minerals Schist, granite, or volcanic rocks Coarse Medium to Marble Interlocking calcite or dolomite grains Limestone, dolostone Coarse Medium Quartzite Fused quartz grains, massive, very hard Quartz sandstone Coarse Fine Anthracite Shiny black organic rock that may exhibit conchoidal fracture Bituminous coal