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Ideally , they 'll possess an abundance of energy and be good salespeople . The outcrops retain the dark gray color of their origins , but metamorphosis created an abundance of micas , the shiny , planar minerals that reflect like glass in the sun , as well as parallel lines within the rocks , called foliation , which impart a layered look to the outcrops . " If methyl cyanide is a particularly abundant component , it would suggest that comets could have delivered an abundance of these highly reactive compounds to the early Earth , " notes Tom McCollom , a researcher at the University of Colorado at Boulder 's Laboratory of Atmospheric and Space Physics . In addition , studies of embryonic development often reveal an abundance of vestigial features , some examples of which are given here .