Clay is a finely-grained natural rock or soil material that combines one or more clay minerals with possible traces of quartz, metal oxides and organi...
Salt is a mineral substance composed primarily of sodium chloride (NaCl), a chemical compound belonging to the larger class of ionic salts; salt in it...
Granite is a coarse-grained intrusive igneous rock composed primarily of light-coloured minerals. It is an igneous rock with at least 20% quartz by vo...