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Definition of Pitchstone
1. Noun. Dark acid granitic glass.
Definition of Pitchstone
1. n. An igneous rock of semiglassy nature, having a luster like pitch.
Definition of Pitchstone
1. Noun. (geology) a natural glass, that is rich in microscopic crystallites, formed by the rapid cooling of lava or magma ¹
¹ Source: wiktionary.com
Medical Definition of Pitchstone
1.
Lexicographical Neighbors of Pitchstone
Literary usage of Pitchstone
Below you will find example usage of this term as found in modern and/or classical literature:
1. The Ancient Volcanoes of Great Britain by Archibald Geikie (1897)
"end is truncated, so as to lay open a section of the gravelly deposit along which
the pitchstone flowed. The accompanying diagram (Fig ..."
2. Elements of Chemical and Physical Geology by Gustav Bischof (1859)
"The dark-coloured mass resembling pitchstone, contains narrow crystals of ...
pitchstone occurs both as a rock, and as dykes and beds, in various rocks. ..."
3. Encyclopaedia Americana: A Popular Dictionary of Arts, Sciences, Literature by Francis Lieber, Thomas Gamaliel Bradford (1832)
"pitchstone often contains those faces which are culled the faces ... pitchstone
forms mountain masses, and is generally in close connexion with porphyry. ..."
4. The Earth's History: An Introduction to Modern Geology by Robert Davies Roberts (1893)
"If a section could have been taken across it immediately after the pitchstone
eruption, it would have presented some such appearance as that in Fig. 43. ..."
5. A Treatise on Mineralogy by Charles Upham Shepard (1857)
"The varieties of pitchstone have generally been treated of, under the following
heads: obsidian, having a very dark color, a perfectly conchoidal fracture ..."
6. The Cruise of the Betsey: Or, A Summer Ramble Among the Fossiliferous by Hugh Miller (1860)
"... of Eigg —Chapel of St. Donan—Shell-sand —Origin of Secondary Calcareous Rock
suggested— Exploration of Eigg — pitchstone Veins — A Bone Cave—Massacre at ..."
7. Manual of Geology: Practical and Theoretical by John Phillips (1855)
"pitchstone. As before observed, pitchstone occurs in the Isle of Arran both in
dikes and interposed beds among the sandstone strata. ..."
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