Assertion: precipitate | /r/HasAspect | perfect icosahedral symmetry
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Source sentences:
text: Currently, there is a lack of convergent beam electron diffraction patterns to establish unambiguously whether these precipitates have a perfect icosahedral symmetry or are a crystalline approximant with a very large unit cell parameter, but atomic-resolution transmission electron microscopy does not reveal any periodic crystal structure or nanoscale twins existing within such particles.