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Best Answer: Intermediate rocks contain between 53% and 65% silica. They also contain potassium and plagioclase feldspar with a small amount of quartz.est Answer: Intermediate rocks contain between 53% and 65% silica. They also contain potassium and plagioclase feldspar with a small amount of quartz.
Unconsolidated sediment of this size is generally called gravel, but some sedimentologists subdivide this size fraction into pebbles, cobbles and boulders (see Table 3.1). A sedimentary rock composed of gravel would be called a conglomerate if the grains are rounded, or a breccia if the grains are angular.hapter 3: Sedimentary Rocks 36 Figure 3-1: Variations in (A) grain size, (B) rounding and (C) sorting for particles in sedimentary rocks Medium-grained siliciclastic sediment (grain size between 0.063mm and 2mm) is called sand and the rock composed of this material would be called a sandstone.