Fabianite and its synthetic dimorph, CaB 3 O 5 (OH); new data

The structure and other crystallographic properties of the synthetic compound CaB 3 O 5 (OH) were reported by Clark et al (1962) and a crystallographic description of the new mineral fabianite, of the same composition, was published by Kuhn et al (1962). In this study the space group and unit-cell parameters of fabianite were determined, and the optical properties and crystal habits of both dimorphs were redetermined. Results are tabulated with those of the previous investigators for comparison.