Brauns, R. (Reinhard), 1861-1937, Spencer, Leonard James, 1870- · Esslingen a. N. : J. F. Schreiber · leaf 250
ts chemical composition, this mineral is analogous to spinel, but in crystalline form there is no relation between these two species. Here beryllia takes the place of magnesia in spinel, the formula being BeO. Al.,0.,. The percentage composition corresponding with this formula is: beryllia (BeO)… … a heart-shaped compound crystal Twinned crystal (triplet) of Simple crystal of Chrysoberyl (var. Alexandrite). Chrysoberyl. (plate 45, fig. 5), or three indi- viduals producing a pseudo-hexa- A twin, or rather trilling, of the latter kind is represented d form (fig. 8). diagrammatically in…
Mineralogy
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