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Summary Of Polymorphism Of Minerals

2012-1-16The Al 2 SiO 5 Polymorphs. The three Al 2 SiO 5 polymorphs minerals are very important in metamorphic petrology as they are indicators of metamorphic grade i.e., metamorphic facies or isograds.. The principals of basic thermodynamics tell us that for an isochemical one component system with three phases i.e., the aluminium silicate system, there will only be one temperature and