Allochemical rocks are those that contain grains brought in from elsewhere ie. The rock cycle shows that both igneous and sedimentary rocks can become. Learning Geology Rocks Shale Geology Rock Identification D oʊ ˌ t aɪ t p ə ˈ r ɪ d. . Those whose original components were not bound together during deposition and those whose original components formed in place and consist of intergrowths of skeletal material. The latter group are called boundstones similar to biolithite of the Folk classification. These sedimentary rocks were deeply weathered and this weathering released silica into the groundwater. ˈ p ɛ r. Rocks that originally contained mostly quartz and feldspar like granitic rocks and arkosic sandstones will also contain an abundance of quartz and feldspar as metamorphic rocks since these minerals are stable over a wide range of temperature and pressure. Those that exhibit mostly quartz and feldspar with only minor a
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