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A transmission electron microscope investigation was performed on a series of synthetic clinopyroxenes with compositions between Ca 0.7 Mg 1.3 Si 2 O 6  and Ca 0.5 Mg 1.5 Si 2 0 6 . For samples with Ca content lower than 0.6 atoms per formula unit (apfu) selected-area electron diffraction (SAED) patterns showed the presence of reflections violating the C2/c space group (b type, h+k odd), indi­cating a transition to the P2 1 /c symmetry at room temperature. Antiphase domains induced by the transition could be imaged, with irregular boundaries and size decreasing with increasing Ca con­tent. The antiphase domain size and shape appears unrelated to the non-periodic mottled texture that could be imaged in samples with Ca lower than about 0.65 apfu.

american mineralogist

A transmission electron microscope investigation of the C2/c→ P2 1 /c phase transition in clinopyroxenes along the diopside-enstatite (CaMgSi 2 O 6 -Mg 2 Si 2 O 6 ) join