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Hornstone :: Hornstone (n.) A siliceous stone, a variety of quartz, closely resembling flint, but more brittle; -- called also chert..

Chert :: Chert (n.) An impure, massive, flintlike quartz or hornstone, of a dull color..

Woodstone :: Woodstone (n.) A striped variety of hornstone, resembling wood in appearance..

Xanthidium :: Xanthidium (n.) A genus of minute unicellular algae of the desmids. These algae have a rounded shape and are armed with glochidiate or branched aculei. Several species occur in ditches, and others are found fossil in flint or hornstone..

Corniferous :: Corniferous (a.) Of or pertaining to the lowest period of the Devonian age. (See the Diagram, under Geology.) The Corniferous period has been so called from the numerous seams of hornstone which characterize the later part of the period, as developed in the State of New York..

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