Diamonds and precious stones, a popular account of gems .. (1874)
Dieulafait, Louis, b. 1830, Sanford, Fanchon, tr · New York, Scribner, Armstrong, and Company · leaf 24
finely these may have beenpulverized, and hence they must have been in thecondition of either gases or liquids. Nature has amultitude of means by which these transformationsof matter are effected, all referable to three generalprocesses:— 1st. Direct fusion of the substance by the actionsolely of… … *^«V^--Til/SB! ORIGIN OF PRECIOUS STONES. 5 From the point of view of their formation, there-fore, precious stones may be naturally divided intotwo classes. The first comprehends stones produced by directfusion, by crystallization in an excess of theirmeked substance, by volatilization of their…
Precious stones · Diamonds · Gems
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