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Barite
Source volume: 39, issue: 4, PDF page: 34. Label: Figure. 23. Backscattered electron images of synthetic barite crystals and rosettes grown by diffusion in organic gels. (a) The rounded habit of a single barite crystal. (b) A radial array of rounded crystals about a central core. (c) A rosette formed by a concentric array of barite crystals off a central medial crystal. (d) A high degree of curvature is evident in the stepped growth of this barite crystal; except for a few platelets at the end, this appears to represent a single crystal. (e) Overall rounding of individual crystals occurs because of the decreasing radius of growth steps in the [100] direction of barite growth. Interpenetrating crystals like these two are common in the experiments, but the angular relationship between the main crystal and its epitactic intergrowth are not the same as in the barite roses. (f) A single, stepped barite crystal exhibits the “butterfly” habit of accentuated growth along the [110] directions through the crystal; this is the habit anticipated by rapid growth along the corners of the crystal. Other reentrants into the crystal are unexpected consequences of rapid growth in the organic gel.
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