Igneous rocks: Interlocking crystals , No fossils, Can be glassy, Can be porous, Not friable, Sedimentary rocks: Most likely to have fossils, Obvious sediment particles, Usually friable, Easily weathered, No crystals , Dull in appearance, straight layers, metamorphic rocks: deformed fossils, mineral banding/foliation, can contain crystals, can be shiny/reflects light, non-friable (metamorphic),

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