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Use the flow chart on the following slide to identify your rocks.
Determine the type of each rock (igneous, sedimentary, or metamorphic).
Write your names, rock ID #’s, rock names, and rock types on a sheet of paper to hand in.
Granite Basalt Sandstone Shale Limestone Gneiss Schist Can you see the mineral grains? Are the grains interlocking, or cemented together? Are there layers or stripes (foliation) to the grains? yes no interlocking cemented yes no Is the rock “scaly” or “glittery”? yes no Is it very dark colored (mafic)? yes no Definitive test: Does it react to a weak acid by “fizzing”? Ok substitute test for today: is it layered in flat sheets? no yes yes no Double check: is it layered in flat sheets? no yes Include Rock # Rock Name Rock Type