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cryptocrystalline

A Dictionary of Earth Sciences | 1999 | | © A Dictionary of Earth Sciences 1999, originally published by Oxford University Press 1999. (Hide copyright information) Copyright

cryptocrystalline Applied to a very fine aggregate of crystals in an igneous rock, and to minerals in which the individual crystals are too fine to be distinguished even under a petrological microscope. They will produce a diffraction pattern with X-rays. Rapid cooling of a magma as it is extruded as a lava often produces cryptocrystalline aggregates of minerals.

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AILSA ALLABY and MICHAEL ALLABY. "cryptocrystalline." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 11 Nov. 2009 <http://www.encyclopedia.com>.

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