SRMP Dynamic Earth Curriculum - American Museum of Natural ...

Science Research Mentoring ProgramDynamic EarthSession Three: RocksACTIVITY: Viewing Rock Faces (Continued)Can you see grains or crystals? Yes No Does the rock have crystals (flat shiny surfaces) or grains (pieces of other rocks broken down and maybe worn down)? Does the rock fizz when you put acid on it? Crystals Grains Yes No Does the rock fizz when you put acid on it? Does the rock fizz when you put acid on it? Yes No Yes No Limestone or Shale Mudstone Marble Are the crystals arranged in layers? Limestone Are the grains like sand or pebbles? Yes No Sand Pebbles Can you see light and dark bands? Are the crystals light or dark? Sandstone Are the pebbles rounded or angular? Yes No Dark Light Rounded Angular Gneiss Yes Are the crystals shinny or flaky? No Are the crystals mostly coarse or fine? Coarse Are the crystals mostly coarse or fine? Fine Coarse Fine Conglomerate Breccia Schist Does the rock break along flat surfaces? Gabbro Basalt Are the crystals all the same color? Rhyolite Yes Slate Quartzite Yes No Granite © 2013 American Museum of Natural History. All Rights Reserved. 19