Brauns, R. (Reinhard), 1861-1937, Spencer, Leonard James, 1870- · Esslingen a. N. : J. F. Schreiber · leaf 279
us other faces have been recorded on quartz crystals but they are rare, and the basal plane is extremely rare as a small corroded face. Narrow faces of steeper rhombohedra are seen in plate 54, fig. 3. Except in very rare cases, the trapezohedral faces are placed beneath the positive rhombohedron… … Fig. 204. structure is marked out by the alternation Rock-crystal showing layers of growth (“Ghost-quartz”): of lighter and darker bands. In the from Goyaz, Brazil.
Mineralogy
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