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Cryptocrystalline

From Wikipedia, the free encyclopedia

Cryptocrystalline is a rock texture made up of such minute crystals that its crystalline nature is only vaguely revealed even microscopically[1] in thin section by transmitted polarized light. Among the sedimentary rocks, chert and flint are cryptocrystalline. Carbonado, a form of diamond, is also cryptocrystalline. Volcanic rocks, especially of the felsic type such as felsites and rhyolites, may have a cryptocrystalline groundmass as distinguished from pure obsidian (felsic) or tachylyte (mafic), which are natural rock glasses. Agate and onyx are examples of cryptocrystalline silica (chalcedony).

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See also

References

  1. ^ American Geological Institute (1984). Bates, Robert Latimer; Jackson, Julia A. (eds.). Dictionary of geological terms (3rd ed.). Garden City, New York: Anchor Press/Doubleday. p. 120. ISBN 0385181000. OCLC 9412868.


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This page was last edited on 21 January 2023, at 09:47
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