In photograph of the solid in firebrick -- what is what the change of solid photograph points to?

   In the process of fireproof material production of firebrick etc, often can produce solid photograph -- the transition process of solid photograph. This kind of change is crystal by a kind of structure toThe process that another kind of structure transforms, common in silicate firebrick. Have so a concept, if,crystal is in inside constant temperature limits of a kind of structure fromBy enthalpy low, the crystal that shows this kind of structure is stable below this kind of temperature, and additionally one kind of structure often is inside limits of another kind of temperatureCrystal freedom enthalpy is low, the structure is stable also. Because of this change as temperature, crystal becomes another kind of brilliant from a kind of brilliant change model, for example, in silica brickIn firebrick, the brilliant of SiO2 change etc. If you come to our professional lab observation, your meeting sees clearly, in the brilliant inside distinct temperature rangeModel change.