n.
Any of various volcanic glasses distinguished by their dull pitchlike luster.
[Translation of German Pechstein.]
pitchstone
Dictionary:
pitch·stone (pĭch'stōn') 
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n.
Any of various volcanic glasses distinguished by their dull pitchlike luster.
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| Sci-Tech Encyclopedia: Pitchstone |
A natural glass with dull or pitchy luster and generally brown, green or gray color. It is extremely rich in microscopic, embryonic crystal growths (crystallites) which may cause its dull appearance. The water content of pitchstone is high and generally ranges from 4 to 10% by weight. Pitchstone is formed by rapid cooling of molten rock material (lava or magma) and occurs most commonly as small dikes or as marginal portions of larger dikes. See also
| Archaeology Dictionary: pitchstone |
[Ma]
Dark-coloured type of obsidian resembling pitch. Widely used by prehistoric stoneworkers wherever it outcrops.
| WordNet: pitchstone |
Note: click on a word meaning below to see its connections and related words.
The noun has one meaning:
Meaning #1:
dark acid granitic glass
| Wikipedia: Pitchstone |
Pitchstone is a dull black glassy volcanic rock formed when lava cools swiftly. It is similar to but coarser than obsidian.
The ridge of An Sgurr on the Isle of Eigg was originally formed as a lava flow in a valley. Pitchstone is very resistant to erosion.
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 | resinous luster (geology) |
| rock (in geology) |
| pitch |
 | What is the hardness of obsidian-pitchstone according to Mohs Scale of hardness? Read answer... |
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 | Dictionary. The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved. Read more |
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| Sci-Tech Encyclopedia. McGraw-Hill Encyclopedia of Science and Technology. Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved. Read more |
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| Archaeology Dictionary. The Concise Oxford Dictionary of Archaeology. Copyright © 2002, 2003 by Oxford University Press. All rights reserved. Read more |
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| WordNet. WordNet 1.7.1 Copyright © 2001 by Princeton University. All rights reserved. Read more |
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| Wikipedia. This article is licensed under the Creative Commons Attribution/Share-Alike License. It uses material from the Wikipedia article "Pitchstone". Read more |
