a piece of limestone rock on white background.

argillaceous background basalt black call carbon clastic clay claysize coal commonly compaction composed darkcolored environment environmental fine finegrained foliated forms fossil fuel gem gemmology gemology geological geology green igneous isolated lamination limestone macro mainly mineral minerals mud natural nature ore particles piece plagioclase pyroxene raw red rock rocks rough sand science sedimentary shale shooting shows silt single solid specimen spinach stone structure tectonics texture that typically volcano white