meaning of crystallite
1. A minute mineral form like those common in glassy volcanic rocks and some slags, not having a definite crystalline outline and not referable to any mineral species, but marking the first step in the crystallization process. According to their form crystallites are called trichites, belonites, globulites, etc.
2. any of numerous minute rudimentary crystalline bodies of unknown composition found in glassy igneous rock
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