How can I tell if the rock is metamorphic, sedimentary, or igneous just by looking at a rock?

Question

How can I tell if the rock is metamorphic, sedimentary, or igneous just by looking at a rock? I have a regents practicum tomorrow and I have no idea. I know what the difference is about the rocks but I need to know what they look like.

Answer 1

im in the same boat.  

Metamorphic- foliated bands, distortion, and intergrown crystals

Sedimentary- visible particles or sediments, layers, and fossils

Igneous- large intergrown crystals, glassy texture, porous (vesicular)

Hope this helps!  im stressing over epicenters.