1. 
   Xenoliths
   Pieces of other rock embedded in an igneous rock, usually fragments of host rock which fall into the magma.
   Found op http://www.quartznall.co.uk/azhealthguide.htm
   
   
2. 
   Xenoliths
   A foreign inclusion in an igneous rock.
   Found op http://volcano.oregonstate.edu/education/glossary.html
   
   

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