The difference between limestone and shale
A deep acid igneous rock, belonging to igneous rock. Granite. Silica content is more than 70%. A blocky, granitic mosaic structure often weathered by a ball. Lighter in color, more commonly seen in gray and flesh red. Mainly composed of quartz (hardness 7), feldspar (hardness 6) and a small amount of biotite (hardness 2-4) and other dark minerals. The content of quartz is 20% ~ 40%, and the alkali feldspar is more than plagioclase, which accounts for about 2 / 3 of the total amount of feldspar.
Limestone is a relatively hard rock that is mainly composed of calcium carbonate (CaCO3). This rock has a stronger resistance to mechanical and physical weathering, but is easily dissolved by acidic water, because acid solutions can react with limestone to make rock eroded. If we drop hydrochloric acid on the limestone, a lot of white bubbles will pop up at once, as if boiling. After a while, rinse off the foam with water, leaving a clear mark on the limestone.
A small particle of rock hardened by clay, which is easily broken and divided into distinct layers.A type of clay rock. In addition to complex composition, clay minerals (such as kaolinite, montmorillonite, beidellite hydromica, etc.), also contains a lot of detrital minerals (such as quartz, feldspar, mica etc.) and authigenic minerals (such as iron, aluminum, manganese oxide and hydroxide etc.). Having a sheet or sheet of bedding. Strike with hard material; easily split into fragments.
