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{%type%} Definitions

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Short "hint"

n. - A fine-grained metamorphic rock formed by the action of heat on clay rocks.

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Usage examples (15)
  • Chert is sometimes called hornstone; also the term chert is often applied to any impure flinty rock, including jaspers.
  • "hornstone" type, with porphyritic developments of silicate minerals.
  • On the summit I found hornstone and granular felspar.
  • These hills are of limestone, and rounded, resting upon others of hornstone and jasper.
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