pitchstone

[pich-stohn]

noun

1. a glassy volcanic rock having a resinous luster and resembling hardened pitch.

pitchstone

/ ˈpɪtʃˌstəʊn /

noun

1. a dark glassy acid volcanic rock similar in composition to granite, usually intruded as dykes, sills, etc

Word History and Origins

Origin of pitchstone¹

1775–85; translation of German Pechstein. See pitch ², stone

Word History and Origins

Origin of pitchstone¹

C18: translation of German Pechstein

Example Sentences

Such media are the volcanic rocks when they are rapidly cooled, producing various kinds of pitchstone, obsidian, &c.

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There are numerous varieties of lava, such as basalt, obsidian, pitchstone, pearlstone, trachyte, &c.; some are heavy compact rocks, others are light and porous.

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The walls, or banks, of the channel have been denuded away, thus converting the pitchstone casting into a projecting wall of rock.

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The lavas comprise dark pitchstone, resembling that at Kirk Yetholm, and porphyritic and amygdaloidal andesites and basalts.

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If pumice was to be found anywhere in Scotland, we might a priori expect to find it in connection with by far the largest mass of pitchstone in the kingdom.

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