Fissile

[Sarah]

Capable of being split, cleft, or divided in the direction ofthe grain, like wood, or along natural planes of cleavage, likecrystals.This crystal is a pellucid, fissile stone. Sir I. Newton.

[Gregory]

[Something] that undergoes [scientific] [fission], which is dividing or spiliting up.

[Ernesto]

(of an atom or element) able to undergo nuclear fission.

[Magaret]

(of rock) able to be divided easily into pieces: