Pitchstone is a dull black glassy volcanic rock formed when
The ridge of An Sgurr on the Isle of
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Pitchstone — Pitch stone , n. (Geol.) An igneous rock of semiglassy nature, having a luster like pitch. [1913 Webster] … The Collaborative International Dictionary of English
Pitchstone — Pitchstone, so v.w. Pechstein … Pierer's Universal-Lexikon
pitchstone — [pich′stōn΄] n. [calque of Ger pechstein < pech (< L pix), PITCH1 + stein,STONE] a volcanic glass that somewhat resembles pitch and has a higher percentage of water than obsidian or other glassy rocks … English World dictionary
pitchstone — /pich stohn /, n. a glassy volcanic rock having a resinous luster and resembling hardened pitch. [1775 85; trans. of G Pechstein. See PITCH2, STONE] * * * ▪ natural glass a volcanic glass with a conchoidal fracture (like glass), a resinous… … Universalium
pitchstone — noun a natural glass, that is rich in microscopic crystallites, formed by the rapid cooling of lava or magma … Wiktionary
pitchstone — noun Geology a dull vitreous rock resembling hardened pitch, formed by weathering of obsidian … English new terms dictionary
pitchstone — /ˈpɪtʃstoʊn/ (say pichstohn) noun a glassy igneous rock having a resinous lustre and resembling hardened pitch. {pitch2 (noun) + stone, translation of German Pechstein} …
pitchstone — n. obsidian etc. resembling pitch … Useful english dictionary
An Sgurr (Eigg) — Infobox Mountain Name = An Sgurr Photo = Eigg.AnSgurr.Canthusus.jpg Caption = The Nose of Sgurr, seen from the southeast Elevation = 393 m (1289 ft) Location = Eigg, SCO Prominence = 393 m Parent peak = none HP Eigg Coordinates = Topographic OS… … Wikipedia
Owyhee Dam — View from the north Location Malheur County, Oregon Coordinates … Wikipedia
