cryptocrystalline

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Related to Cryptocrystal: Macrocrystalline, Conchoidal fracture

cryptocrystalline

[¦krip·tō′krist·əl·ən]
(geology)
Having a crystalline structure but of such a fine grain that individual components are not visible with a magnifying lens.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

cryptocrystalline

A rock texture that is too fine to be discernible with an optical microscope.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.