![How do you recognize limestone and marble? [USGS]](/6ky5vhl/55.jpg)
How do you recognize limestone and marble? [USGS]
Marble forms when sedimentary limestone is heated and squeezed by natural rockforming processes so that the grains recrystallize. If you look closely at a limestone, you can usually see fossil fragments (for example, bits of shell) held together by a calcite matrix. Limestone is more porous than marble, because there are small openings between ...