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The structure of mozartite, CaMn 3+ O[SiO 3 OH], was refined in space group P2 1 2 1 2 1  from X-ray single-crystal data collected at 100 K (R = 2.45%, R w  = 2.62%), 300 K (R = 2.60%, R w  = 2.68%), and 500 K (R = 2.79%, R w  = 2.81%). The Mn 3+ O 6  octahedron shows approximately orthorhombic geometry, which is explained by a combination of a tetrag- onally compressed Jahn-Teller effect with lattice-induced stress. Comparison with isostruc- tural vuagnatite, CaAl(OH)SiO 4 , which shows no distortions due to electronic effects, in­dicates that the distorted octahedral geometry in mozartite causes shifts in valence sums of the O atoms that are hydrogen bonded. As a result, the OH group in mozartite is located at the isolated SiO 4  apex and is not linked to the octahedron as reported for isostructural minerals. Isostructural minerals of the adelite group with tetrahedral As 5+  and V 5+  exhibit a different Jahn-Teller distortion with tetragonally elongated geometry for octahedral Cu 2+ O 6 .

Orthorhombic Jahn-Teller distortion and Si-OH in mozartite, CaMn 3+ O[SiO 3 OH]: A single-crystal X-ray, FTIR, and structure modeling study