cryptocrystalline

Use Cryptocrystalline in a sentence

cryptocrystalline

[krip-toh-kris-tl-in, -ahyn]
adjective Mineralogy.
having a microscopic crystalline structure.

Origin:
1860–65; crypto- + crystalline

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Collins
World English Dictionary
cryptocrystalline (ˌkrɪptəʊˈkrɪstəlaɪn)
 
adj
(of rocks) composed of crystals that can be distinguished individually only by the use of a polarizing microscope

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
cryptocrystalline   (krĭp'tō-krĭs'tə-lĭn, -līn')  Pronunciation Key 
Having a microscopic crystalline structure, as the mineral chalcedony does.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
They are microcrystalline or cryptocrystalline varieties which show different
  textures depending on the fibrous habit.
Chalcedony is a catch all term that includes many well known varieties of
  cryptocrystalline quartz gemstones.
As opal ages geologically, it dewaters and ultimately devitrifies to quartz as
  chalcedony, a cryptocrystalline variety of quartz.
Consists of light- to medium-gray and dark-gray, cryptocrystalline to coarsely
  crystalline, thin- to medium-bedded limestone.
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