Diamonds and precious stones, a popular account of gems .. (1874)
Dieulafait, Louis, b. 1830, Sanford, Fanchon, tr · New York, Scribner, Armstrong, and Company · leaf 31
Fig. 6.—Calamité. Fig. 6*.—Lepidodendron of the Coal Formation. from those that exist in the present condition of ourglobe ; and their dominant races, long since extinct, I o PRECIOUS STONES. have furnished names for remote eras,—for all thegeological ages, indeed, included between the azoicage and… … Fig. 7.—Fossil Dragon-fly of the Secondary Epoch. ever appears, or possibly could appear, in rocks ofthis kind. In sedimentary formations, on the con-trary, such remains abound, and furnish anotherexcellent means of distinguishing them from theigneous rocks. A few illustrations will exemplify types…
Precious stones · Diamonds · Gems
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