Diamonds and precious stones, a popular account of gems .. . Fig. g.—Terebratula. Fig. lo.—Mammillary Ammonite. and are found in rocks belonging to what has beencalled the primary or palaeozoic period. Those represented by Figs. 7, 8, 9, and 10 ap-pertain to the secondary formations, such as the 12 PRECIOUS STONES. oolite or Jurassic formation, named from the JuraMountains, in whose rocks such specimens are

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Keywords: ., bookcentury1800, bookdecade1870, booksubjectgems, booksubjectprec