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The crystal structure of axinite, H(Fe,Mn)Ca 2 Al 2 BSi 4 O 16 , has been redetermined and refined from three-dimensional, equi-inclination diffractometer intensity data. The crystal used in this study came from Woodlake, California, and has an Fe:Mn ratio close to 1:1. Its unit-cell constants are:  a  = 7.1566(15),  b  = 9.1995(20),  c  = 8.959(2) Å,  α  = 91.8(8)°,  β  = 98.14(02)°,  γ  = 77.30(02)° and its space group is  P [unk]. The final  R  value is 0.042.

The B 2 Si 8 O 30 groups of tetrahedra in axinite and comments on the deformation of Si tetrahedra in silicates