°Massive generally dull colored and usually opaque
quartzite or hornstone or impure
chalcedony or other
flint-like mineral. By general usage in mineralogy and geology, a chert does not have a
conchoidal fracture. In North American
archeology the term chert occasionally is still used for various
siliceous minerals (including flint) that have a conchoidal fracture; this leads to confusion between the terms flint and chert in some archeology texts.