a. flint

Science Dictionary
flint   (flĭnt)  Pronunciation Key 
  1. A very hard, gray to black variety of chalcedony that makes sparks when it is struck with steel. It breaks with a conchoidal fracture.

  2. The dark gray to black variety of chert.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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