Ziemath, E. C. [UNESP]Diaz-Mora, N.Zanotto, E. D.2014-05-272014-05-271997-02-01Physics and Chemistry of Glasses, v. 38, n. 1, p. 1-5, 1997.0031-9090http://hdl.handle.net/11449/65038With suitable thermal treatments, a nearly stoichiometric cordierite glass (2 MgO.2 Al2O3. 5 SiO2) shows a variety of crystal morphologies on the external surfaces: lozenges, regular and elongated hexagons, spherical and square shaped particles. We initially identified these morphologies through optical and scanning electron microscopy techniques. Their structural features were distinguished by x-ray diffraction patterns, infrared and Roman microprobe spectra. We concluded that there are close structural similarities for: lozenges and glass matrix; regular and elongated hexagons; spherical and square particles. The ordering degree increases in the following sequence: glass matrix, lozenges, hexagons, squares and spheres. The lozenge crystals are known as X-phase. The hexagons belong to the μ-cordierite (high quartz solid solution) metastable phase and the squares and spheres to the α-cordierite stable phase.1-5engArtigoAcesso restrito2-s2.0-00132172847698772123076672