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A transmission electron microscopy (TEM) investigation was performed on Ca-rich feldspars along the join CaAl 2 Si 2 O 8 -SrAl 2 Si 2 O 8  (An-SrF). Two series of samples were synthesized by dry (T = 1450 °C, t = 96 h) and hydrothermal (PH2O = 2 kbar, T = 600 °C, t = 300 h) annealing with compositions between An100 and An 50 SrF 50 . TEM investigation at room temperature showed the presence of sharp c-type reflections only in hydrothermal An100 and An 80 SrF 20  feldspars, whereas diffuse and elongated c reflections were found in all other feldspars in the range An 80 SrF 20 -An 50 SrF 50 . The intensity of c reflections decreases with increasing Sr content, and fully disappears only at An 50 SrF 50 .

TEM observations on the P1̄ -I1̄ phase transition in feldspars along the join CaAl 2 Si 2 O 8 -SrAl 2 Si 2 O 8