CATALOGUE OF GEMS AND PRECIOUS STONES. 69 



JAPAN. 

 Ring; light gray-green, translucent; 7 cm. diameter No. 1190 



NEW ZEALAND. 



Two cameos and one intaglio; rectangular girdle; dark green; 18 by 15, 

 15 by 12; 16 by 13 mm > * No. 1185 



Carved piece, book-shaped ; 28 by 19 by 6 mm. ; and two pear-shaped pend- 

 ants, 6.4 and 5.5 cm. long; dark green No. 1184 



UNITED STATES. 



Alaska. 



One labret; olive-green; 9 cm. long No. 1194 



LOCALITY NOT RECORDED. 



Two cabochons, rectangular girdle; dark green; 14.76 and 9.5 carats; 20 by 



11, and 14 by 11 mm No. 1192 



Pendant; three links carved from one piece; pale gray. Isaac Lea collec- 

 tion No. 1195 



Jadeite. — See under Jade. 

 Jasper. — See under Chalcedony. 



KYANITE. 



Synonym. — Often spelled cyanite. 



Composition. — Aluminum oxy-orthosilicate, A1 2 3 (Si0 4 ). 



Crystallization. — Triclinic ; habit bladed. 



Color. — Colorless when pure; often blue owing to the presence of 

 impurities of unknown nature. 



Luster. — Vitreous; translucent to transparent. 



Hardness. — 7 in one direction, 5 in the other; not very durable. 



Specific gravity. — 3.60 ±0.05. 



Optical properties. — Mean refractive index, 1.72; double refrac- 

 tion moderate, 0.015; optically biaxial, negative. 



A great variation in hardness is highly characteristic. It is rarely 

 found clear enough to be used as a precious stone, but is occasionally 

 cut. 



LIST OF SPECIMENS. 

 RUSSIA. 



Step, rectangular girdle; blue; 0.579 carats; 7 by 4 by 2 mm No. 565 



UNITED STATES. 



North Carolina. 



Spruce Pine, Mitchell County : 



Step, rectangular girdle; deep blue; 3.728 carats; 12 by 7 by 5 mm. 

 Gift of D. A. Bowman No. 564 



Kunzite. — Seo undor Spodumene. 

 Labradorite. — See under Feldspar. 

 Lapis-lazuli. — See undor Lazurite. 



