A piece of rock within an igneous rock that is not derived from the original magma but has been introduced from elsewhere, especially the surrounding country rock.
- However, rare xenoliths of sedimentary rocks occur in the granite.
- The granite contains abundant xenoliths of the country rock.
- If the magma has risen quickly from the source region of the volcano, the xenoliths may represent country rock from all levels of the crust through which it has travelled.
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