Diamonds and precious stones, a popular account of gems .. (1874)
Dieulafait, Louis, b. 1830, Sanford, Fanchon, tr · New York, Scribner, Armstrong, and Company · leaf 148
r nature is the same. The occidentaltopaz is in all cases formed of alumina, silica, andfluoric acid. The presence of this last substance,found in no other precious stone, characterizes per-fectly the genus topaz in respect to chemicalcomposition. The primitive type of crystals of topaz is theright… … if THE TOPAZ. 129 The Saxon topaz generally occurs in the form ofa rhomboidal prism with a base; and its colourvaries from an orange yellow to a straw yellow.
Precious stones · Diamonds · Gems
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