Abstract
Peak-fitting of CuKα1,2 X-ray powder diffraction data to sin θ/λ = 0.57 gave 86 integrated (Bragg) intensities which have been used to refine the crystal structure of huntite, CaMg3(CO3)4, to R(F) = 5.3%. A March distribution model was used as the basis of a correction for the effects of preferred orientation of the platey, micrometer-sized crystals. The atomic arrangement in space group R32, a = 9.5027(6) Å, c = 7.8212(6) Å, proposed by Graf and Bradley (1962), is confirmed. Ca and Mg atoms occur within the same cation plane but are ordered with Ca’s in trigonal prism sites (Ca occupancy = 0.99(2) and Mg’s in edge-sharing octahedral sites. Interatomic distances are nearly identical to those of dolomite, CaMg(CO3)2.
This content is PDF only. Please click on the PDF icon to access.
You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
