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A new form of cristobalite, collected in the form of spheroidal particles as the result of hot corrosion of clear fused silica ampoules, has been studied by X-ray diffraction, scanning and transmission electron microscopy. The transparent or translucent spherulites have a round but flattened shape, one vortex and a core made of nanosheets, perpendicular to the surface, organized in a nearly radial...
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