[Proceedings United States National Museum, 1884. Appendix.] 

 SMITHSONIAN INSTITUTION. 



XJNITED ST-A.TE5S N-^TION^Ili MITJSETJM:. 



No. 26. 



PLAN FOR A COLLECTION OP GEMS AND PRECIOUS STONES, 

 TO BE EXHIBITED AT THE CINCINNATI INDUSTRIAL EXPOSI- 

 TION AND THE WORLD'S INDUSTRIAL AND COTTON CENTEN- 

 NIAL EXPOSITION OF 1884-1885, AT NEW ORLEANS. 



By F. W. CliARKE, 



Curator, Department of Minerals. 



The Department ofMineralogy in the United States National Museum 

 will exhibit a series of ornamental and precious stones, both cut and 

 rough, with the object of illustrating the resources of the United States 

 in that peculiarly interesting direction. A fair amount of foreign 

 material will be included for purposes of comparison ; and, for educa- 

 tional reasons, an effort will be made to show each species in as many 

 varieties as possible. The foUowihg minerals are included in theplan^ 

 full species being italicized. 



Diamond: Colorless, yellow, green, blue, pink. Bort. Carbonado. 

 Oortmtiwm: Massive and crystalized, all colors. Euby. Sapphire. As- 



teria. Oriental topaz, amethyst, and emerald. 

 Spinel : Balas ruby, &c. 

 Chrysoberyl : Alexandrite. 

 Buttle, Hematite. 

 Quartz : Eock crystal. Amethyst. Eose, yellow, smoky, blue, green, 



ferruginous, milky, and aventurine quartz. Gold in quartz. 



Sagenitic quartz. Cat's-eye. " Crocidolite." 



Chalcedony. Carnelian. Onyx. Sardonyx. Chrysoprase. 



Heliotrope. Jasper. Agate. Moss-agate. Flint. Cameos 



and intaglios. 

 Opal : Precious opal. Fire opal. Common opal. Queensland opal. 



Cacholong. Hyalite. Opalized wood. 

 Fluor spar : Massive and crystallized. 



Beryl : White, yellow, green, blue. Aquamarine. Emerald. 

 Topaz : White, yellow, pink, blue. 

 Oarnet: Pyrope. Almandine. Essonite. Carbuncle. Grossularite. 



Ouvarovite. 



Ll] 575 



