From The Collaborative International Dictionary of English v.0.48 [gcide]:
6. (Geol.) The property, possessed by some crystalline rocks, of dividing into plates or slabs, which is due to the cleavage structure of one of the constituents, as mica or hornblende. It may sometimes include slaty structure or cleavage, though the latter is usually independent of any mineral constituent, and transverse to the bedding, it having been produced by pressure.
From WordNet (r) 3.0 (2006) [wn]:
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