8-LETTER WORDS
'(<a href="http://www.j-archive.com/media/2009-04-24_DJ_15a.jpg" target="_blank">Jon of the Clue Crew delivers the clue.</a>)  Mica minerals are known for their excellence in this property; see how <a href="http://www.j-archive.com/media/2009-04-24_DJ_15b.jpg" target="_blank">this one breaks cleanly along planes</a>'
cleavage