Studies have shown that mullite crystallizes in the brick of the Kazan Kremlin in the form of primary ("flaky") mullite, pseudomorphs of glass with acicular mullite over feldspar, and pseudomorphs of glass with short-prismatic mullite. The M?ssbauer absorption spectra showed that, in the brick under study, hematite was found on the surface, and magnetite was found in the inner layer.
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UDK 66.3:691.443:666.76
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