Diamonds and precious stones, a popular account of gems .. (1874)
Dieulafait, Louis, b. 1830, Sanford, Fanchon, tr · New York, Scribner, Armstrong, and Company · leaf 150
precious stone, characterizes per-fectly the genus topaz in respect to chemicalcomposition. The primitive type of crystals of topaz is theright rhomboidal prism (Fig. 58). Certain modifications occur in the form of thesecrystals, which, joined to their colour, enable aperson to decide as to which… … Fig. 58.—Type of Crystal of Topaz. The Brazilian topaz exhibits most frequently arhomboidal prism surmounted by a four-faced pyra-
Precious stones · Diamonds · Gems
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