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Tabular tridymite crystals from Ochtendung, Eifel, Germany
Tabular tridymite crystals from Ochtendung, Eifel, Germany
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Solid phase transitions which transform reversibly without passing through the liquid or gaseous phases are called enantiotropic. In contrast, if the
Solid phase transitions which transform reversibly without passing through the liquid or gaseous phases are called enantiotropic. In contrast, if the modifications are not convertible under these conditions, the system is monotropic. Experimental data are used to differentiate between enantiotropic and monotropic transitions and energy/temperature semi-quantitative diagrams can be drawn by applying several rules, principally the heat-of-transition rule, the heat-of-fusion rule and the density rule. These rules enable the deduction of the relative positions of the H and Gisobars in the E/T diagram. [1]
Image: Calcite jaune
Image: Calcite jaune
Image: Aragonite 2 Enguidanos
Image: Aragonite 2 Enguidanos