crystallite

[kris-tl-ahyt]
noun Mineralogy.
a minute body in glassy igneous rock, showing incipient crystallization.

Origin:
1795–1805; crystall- + -ite1

crystallitic [kris-tl-it-ik] , adjective
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World English Dictionary
crystallite (ˈkrɪstəˌlaɪt)
 
n
any of the minute rudimentary or imperfect crystals occurring in many glassy rocks
 
crystallitic
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica
Encyclopedia

crystallite

any of a type of microscopic body occurring in such glassy igneous rocks as obsidian and pitchstone. Crystallites are regarded as incipient or embryonic crystals, though they often have no recognizable crystallographic form and are too small to polarize light. They occur when magma (molten rock material) congeals so rapidly that crystallization remains incomplete. Crystallites are distinguished from microlites, which are slightly larger forms recognizable as mineral species

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Crystallite shape can be determined by measuring crystallite size in several different crystallographic directions.
Their results suggest that the conventional impregnation method leads to crystallite decoration and thus lower activity.
Thus, the accuracy of the measurement is limited by the number of particles as discussed in the section on crystallite statistics.
Stoichiometry per molar ratio as determined by crystallite formation.
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