What Type of Rock do I Have?

Igneous rocks are recognized by:

    the interlocking texture of the grains
    the presence of vesicules (holes) in extrusive igneous rocks
    may be dark-colored and heavy
    may display two grain sizes, one much larger than the other

Sedimentary rocks are recognized by:

    grains cemented together
    the presence of fossils
    light-colored and light weight
    may display interlocking grains but is very light weight

Metamorphic rocks are recognized by:

    the interlocking texture of large grains
    foliation (layering)
    banded light and dark colors
    "ching" sound instead of a "chunk" sound when tapped

Mineral Photos courtesy of R.Weller/Cochise College