Abstract
The principal refractive indices of brushite (CaHPO 4·2H 2O) crystals for sodium light, 589 nm, have been determined by a combination of several methods: microscopic interferometry, retardation measurements with an Ehringhaus 6 λ compensator, and determination of the angle 2 V between optic axes from the measurements of extinction directions using a spindle stage and evaluating the data with the computer program EXCALIBRW. The following values were found: n α =1.54089, n β =1.54620, n γ =1.55191, and 2 V=88.2°. The standard deviations of the three indices lie in the range 7–8×10 −5. The results are regarded valuable in connection with studies of crystal growth kinetics in biological mineralization and related fields.
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