hornstone
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Hornstone — Horn stone , n. (Min.) A siliceous stone, a variety of quartz, closely resembling flint, but more brittle; called also {chert}. [1913 Webster] … The Collaborative International Dictionary of English
hornstone — [hôrn′stōn΄] n. [transl. of Ger hornstein: so named from its appearance] Obs. flint, chert, etc … English World dictionary
hornstone — noun Date: 1728 a mineral that is a variety of quartz much like flint but more brittle … New Collegiate Dictionary
hornstone — /hawrn stohn /, n. Archaic. a variety of quartz resembling flint. [1720 30; trans. of G Hornstein] * * * … Universalium
hornstone — /ˈhɔnstoʊn/ (say hawnstohn) noun 1. a variety of quartz resembling flint. 2. an argillaceous rock baked and partly recrystallised by the heat of an igneous intrusion …
hornstone — n. a brittle siliceous rock … Useful english dictionary
chert — Hornstone Horn stone , n. (Min.) A siliceous stone, a variety of quartz, closely resembling flint, but more brittle; called also {chert}. [1913 Webster] … The Collaborative International Dictionary of English
Chert — (ch[ e]rt), n. [Ir. ceart stone, perh. akin to E. crag.] (Min.) An impure, massive, flintlike quartz or hornstone, of a dull color. [1913 Webster] … The Collaborative International Dictionary of English
Corniferous — Cor*nif er*ous (k?r n?f ?r ?s), a. [L. cornu horn + ferous.] (Geol.) 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… … The Collaborative International Dictionary of English
Quartz — Quartz, n. [G. quarz.] (Min.) A form of silica, or silicon dioxide ({SiO2}), occurring in hexagonal crystals, which are commonly colorless and transparent, but sometimes also yellow, brown, purple, green, and of other colors; also in… … The Collaborative International Dictionary of English
