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Slate
SLATE:
The shale from which slate originate were deposited
previously on clay beds. Subsequent earth movements tilted these beds
of shale, at first horizontal, and the intense metamorphism that
converted these into slates folded and contracted them. Slate, then,
belongs to the metamorphic group of rocks and can be defined as a fine
grain rock derived from clays and shale and possessing a cleavage that
permits it to be split into thin sheets, INTERIOR use only slates are
designates with an ″I″ or ″interior″ on specification sheets. EXTERIOR
use is labels as either ″E″ or ″ exterior″ on specification
sheets.