682 REPORT OF NATIONAL MUSEUM, 1897. 



The principal uouuietallic colors are illustrated by the next forty 

 specimens. They are: 



Snoto ophite: Calcite, Copper Queen Mine, Bisbee, Arizona (Cat. No. 82364, 

 U.S.N.M.). 



(hay white: Quartz, Cumberland, England (Cat. No. 50502, U.S.N.M.). 



Milk white : Novat-ulite, ^Montgomery County, Arkansas (Cat. No. 46280, U.S.N. M.). 



Ash gray: Opal, Honduras (Cat. No. 49632, U.S.N.M.). 



iSmoke gray : Flint, Lains, Jura, France (Cat. No. 46367, U.S.N.M.). 



dray black: Basanite, Wyoming (Cat. No. 44731, U.S.N.M.); collected by F. V. 

 Hayden. 



Jet black: Tourmaline, Pierrepont, St, Lawrence County, New York (Cat. No. 

 48279, U.S.N.M.). 



Blue: Azurite, Clifton, Arizona (Cat. No. 82543, U.S.N.M.). 



Amethyst blue: Amethyst, Thunder Bay, Lake Superior (Cat. No. 49628, U.S.N.M.); 

 the Lea collection. 



Sky blue : Smithsonite, Lauriuni, Greece (Cat. No. 48945, U.S.N.M.). 



Mountain blue: Barite, P'rizington, Cumberland, England (Cat. No. 84144, 

 U.S.N.M.). 



Smalt blue: Dumortierite, Clip, Yuma County, Arizona (Cat. No. 48782, U.S.N.M.). 



Verdigris green : Microcline, Pikes Peak, Colorado (Cat. No. 81993, U.S.N. M.). 



Emerald green: Malachite, Nizhnee-Taghilsk, Russia (Cat. No. 49401, U.S.N. M.) ; 

 gift of Mrs. Mary Stroud. 



Mountain green: Beryl, Yancey County, North Carolina (Cat. No. 51220, U.S.N.M.). 



Lemon yellow : Sulphur, Cianciana, Sicily (Cat. No. 50082, U.S.N.M.). 



Orange yellow: Smithsonite, Morning Star mine, Marion County, Arkansas (Cat. 

 No. 48390, U.S.N.M.). 



Wine yellow : Topaz, Brazil (Cat. No. 44499, U.S.N. M.). 



Il'ax yellow : Selen sulphur, Cianciana, Sicily (Cat. No. 84140, U.S.N.M.). 



Honey yellow: Calcite, Joplin, Missouri (Cat. No. 84165, U.S.N M.). 



Scarlet: Vanadinite, Romaldo Pacheco's mine, Yuma County, Arizona (Cat. No. 

 48793, 1'.S.N.M.); collected by W. F. Hillebrand. 



Blood red: Ziucite, Franklin, New Jersey (Cat. No. 83618, U.S.N.M.); collected 

 by Wirt Tassin. 



Rose red: Tourmaline in lepidolite, San 'Diego, California (Cat. No. 83431, 

 U.S.N.M.); gift of Henry S. Durdan, 



Ease pink: Calcsinter, Reichelsdorf, Hessen, Germany (Cat. No. 84055, U.S.N.M.). 



Brown: Tourmaline, Gouverneur, St. Lawrence County, New York (Cat. No. 82279, 

 U.S.N. M.). 



Yellow brown: Jasper, Portage Group, New York (Cat. No. 49631, U.S.N. M.) ; the 

 Lea collection. 



Hair broivn : Wood Opal, California (Cat. No. 81883, U.S.N.M.). 



The peculiarities in the arrangement of colors are shown in the fol- 

 lowing specimens. They are as follows: 



Play of color: Opal, Queretaro, Mexico (Cat. No. 45014, U.S.N.M.); opal in limoii- 

 ite, Baracoo River, Queensland, Australia (Cat. No. 51965, U.S.N.M.). 



Change of color: Labradorite, Isle of Parul, Labrador (Cat. No. 83605, U.S.N.M.); 

 oligoclase, Krageroe, Norway (Cat. No. 45094, U.S.N. M.). 



Opalescence: Quartz with tremolite inclusions, Ceylon (Cat. No. 81405, U.S.N.M.); 

 opal, Queretaro, Mexico (Cat. No. 81283, U.S.N.M.). 



Iridescence: Albite, Amelia Court-House, Amelia County, Virginia (Cat. No. 48724, 

 U.S.N. M.); oligoclase, Krageroe, Norway (Cat. No. 44776, U.S.N.M.). 



Tarnish : Chalcopyrite with (luartz, Cornwall, England (Cat. No. 16987, U.S.N. M.), 

 the Abert collection; bornite, South Africa (Cat. No. 51882, U.S.N.M.). 



