Quantcast
  We apologize for any slow response. This will be fixed before October 31st Portal logo
Login/Register
Bactrian Gold Treasure from Afghanistan, coming soon....
/diamonds/dieulefait-diamonds-stones/page_026 - 4
 

Ch. 1: Precious Stones Introduction

Ch. 1: Precious Stones Introduction Page of 296 Ch. 1: Precious Stones Introduction Text size:minus plus Restore normal size   Mail page  Print this page
14
PRECIOUS STONES.
tion of the two grand classes of rocks above-men­tioned, we obtain this simple answer:—The calcare­ous element predominates in all sedimentary for­mations (excepting the most ancient); silicious and aluminous elements in igneous formations.
Consequently, stratification, presence and often extreme abundance of fossils, great preponderance of the calcareous element, are the unmistakable char­acteristics of sedimentary formations. Absence of stratification, complete absence of fossils, great pre­ponderance of the silicious and aluminous elements, are the characteristics of igneous formations.
Now if we investigate the chemical composition of precious stones, we shall find that the greater num­ber of those which really merit this appellation, are
Ch. 1: Precious Stones Introduction Page of 296 Ch. 1: Precious Stones Introduction
Suggested Illustrations
Other Chapters you may find useful
Other Books on this topic
bullet Tag
This Page