raw of chert and shale rockin the nature. chert is a sedimentary rock.

almost background black can chert clastic clipping closeup coal common composed consisting crust crystal earths entirely form geology grains granite hard isolated macro material metal metamorphic mineral minerals most natural nature nonfoliated object one ore organic oval path precious quartz quartzite quite raw rock rockin rough round sandsized sandstone sedimentary shale silica stone texture variety ways white