The presence of foliation is a clue to metamorphic rocks (i.e., planar or laminated orientation or banding of mineral, especially micas, and including cleavage), or when non-foliated, the interlocking of nearly equal-sized crystals and the obliteration of &quot;graininess.
(The presence of foliation; is; a clue to metamorphic rocks (i.e., planar or laminated orientation or banding of mineral, especially micas, and including cleavage), or)
The presence of foliation
is
a clue to metamorphic rocks (i.e., planar or laminated orientation or banding of mineral, especially micas, and including cleavage), or