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Cr 3+ -bearing clinozoisite along the join Ca 2 Al 3 Si 3 O 12 (OH)-Ca 2 Al 2 Cr 3+ Si 3 O 12 (OH) was synthesized using cold-seal pressure vessels at P H ₂ O  = 0.35 to 0.40 GPa and T = 500 °C and a piston-cylinder apparatus at P H ₂ O  = 0.8 to 1.5 GPa and T = 500 to 800 °C. Gel-starting materials of Ca 2 Al 3-q Cr 3+  q Si 3 O 12.5  composition with q = 1.00, 0.75, 0.50, and 0.25 were employed to maximize the yields of clinozoisite. Mass fractions of clinozoisite in the experimental products with q = 0.50, 0.75, and 1 were about 70 to 90% along with lesser amounts of eskolaite, garnet, and quartz. Clinozoisite crystallized from the gel with q = 0.25 was associated only with zoisite. The crystal structures of clinozoisite in four runs, containing 0.28, 0.49, 0.50, and 0.62 Cr apfu were refined using X-ray powder diffraction data and the Rietveld method. The amount of Cr 3+  at the octahedral M3 and M1 sites ranged from 0.37(1)-0.16(1) to 0.25(1)-0.12(1) apfu, respectively. Corresponding K D  = (Cr 3+ /Al) M1 /(Cr 3+ /Al) M3  values range between 0.57 and 0.73. The M2 site contained only Al. The KD values, and published results for intracrystalline partitioning in epidote and piemontite, show that the preference of Cr 3+  for M1 is stronger than that of Fe 3+  and Mn 3+  in spite of the fact that most Cr 3+  is partitioned into M3. Unit-cell parameters of clinozoisite increase with increasing Cr 3+ . Variations in macroscopic unit-cell parameters can be related to variations in the local M3-Oi and M1-Oi distances.

A crystal-chemical investigation of clinozoisite synthesized along the join Ca 2 Al 3 Si 3 O 12 (OH)-Ca 2 Al 2 CrSi 3 O 12 (OH)