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The temperature dependence of the lattice parameters of synthetic lawsonite [Ca- Al 2 Si 2 O 7 (OH) 2  . H 2 O], natural zoisite [Ca 2 Al 3 Si 3  O 12 (OH)], natural clinozoisite [Ca 2 Al 3 Si 3 O 12 (OH)], and synthetic diaspore [AlO(OH)] have been measured at ambient pressure. The volume thermal expansion coefficients for lawsonite, zoisite, and clinozoisite are approximately constant over the measured temperature ranges (25-590 °C for lawsonite, 25-750 °C for zoisite, and 25-900 °C for clinozoisite), whereas the thermal expansion of diaspore increases slightly over the range 25-300 °C. Interestingly, the room-temperature volume of clinozoisite is greater than that of zoisite, but this situation is reversed above -300 °C.The experimental results may be summarized as follows: lawsonite: V/V 0 = 1 + 3.16 (± 0.05) × 10 -5  (T - 298), V 0  = 101.51 (± 0.01) cm 3 /mol; zoisite: V/V 0 = 1 + 3.86 (± 0.05) × 10 -5  (T - 298), Vo = 136.10 (± 0.02) cm 3 /mol; clinozoisite: V/V o  = 1 + 2.94 (± 0.05) × 10 -5  (T - 298), V 0  = 136.42 (± 0.05) cm 3 /mol; diaspore: V/V 0 = 1 + 7.96 (± 0.28) × 10 -5  [T - 298 - 20 (√T - √298)], V 0  = 17.74 (± 0.01) cm 3 /mol.

Volume behavior of hydrous minerals at high pressure and temperature: I. Thermal expansion of lawsonite, zoisite, clinozoisite, and diaspore