clastic
    adj 1: of or belonging to or being a rock composed of fragments
           of older rocks (e.g., conglomerates or sandstone)
    2: capable of being taken apart; "the professor had a clastic
       model of the human brain"

Clastic \Clas"tic\, a. [Gr. ? br?, fr. ? to break.]
   1. Pertaining to what may be taken apart; as, clastic anatomy
      (of models).
      [1913 Webster]

   2. (Min.) Fragmental; made up of brok? fragments; as,
      sandstone is a clastic rock.
      [1913 Webster]