Brauns, R. (Reinhard), 1861-1937, Spencer, Leonard James, 1870- · Esslingen a. N. : J. F. Schreiber · leaf 396
st order. Such a form cannot of course exist alone, unless the ends of the crystal are broken. It is shown in combination in plate 72, fig. 6, and plate 73, fig. 2, and with the basal plane in plate 2, fig. 6. Calcite crystals of the form last mentioned are sometimes called “cannon-spar”. In… … represented in text-fig. 256 and in plate 73, fig. 5. In the former, Fig. 255. Twinned crystal of Calcite: showing a cleavage fragment, we see distinctly the twin junction scalenohedron twinned on running through the middle and parallel to the cleavages at the the base. top and bottom. Such a twin…
Mineralogy
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