CATALOGUE OF GEMS. 619 



Olujoclaxf, var. sunstono. Media, Delaware County, Pennsylvania. Color, reddish 



gray. Cal)ochon cut; elliptical girdle. Size, 4;i by 32 by 6 mm. Cat. Nos. 



c-267; 50281. 

 Oligodase, var. sunstone. Media, Delaware County, Pennsylvania. Color, light 



gray. Cabochon cut; elliptical girdle. Size, 27 by 19 by 5.5 mm. Cat. Nos. 



c-268; 50281. 

 Oligodase, var. sunstone. Media, Delaware County, Pennsylvania. Color, streakeo 



white and brown. Kectangular disk. Size, 19 by 11 by 3 mm. Cat. Nos. c-278; 



48933. Gift of Dr. R. H. Lam born. 

 Oligodase, var. moonstone. Delaware County, Pennsylvania. Colorless. Cabochon 



cut. Two gems. Size, 6.5 by 4.5 by 2.5 mm. and 4 by 2 mm. Cat. Nos. e-296- 



297; 82848. The Lea Collection. 

 Oligodase, var. moonstone. Hanover County, Virginia. Colorless. Cabochon cut; 



elliptical girdle. Size, 30 by 15 by 7.5 mm. Cat. Nos. c-284; 47316. Gift of 



C. S. Bement. 

 OZ/^oc/f/.st', var. moonstone. Ceylon. Colorless. Cabochon cut; elliptical and circu- 

 lar girdles. Ninety-one small stones. Cat. Nos. c-298-388; 50328. 

 Oligodase, var. moonstone. Ceylon. Colorless. Cabochon cut; elliptical and circu- 

 lar. Twenty gems. Size of one, 38 by 15 by 9 mm.; of two, 12 by 5 mm.; 



remainder small. Cat. Nos. c-398-108; 82849. The Lea Collection. 

 Oligodase, var. moonstone. Ceylon. Colorless. Triangular pendant. Size, 44 by 



25 by 8 mm. Cat. Nos. c-409; 50263. 

 Onyx; see Carbonate of lime or Quartz. 

 Oolite. Bristol, England. Color, reddish. Paperweight. Size, 10cm. long, 1.8cm. 



diameter. Cat. Nos. 1>-851; 84224. 

 Opal. Garfield County, Washington. Uncut mass. Cat. Nos. b-969; 51863. Gift 



of the Washington Onyx Mining and Milling Company. 

 Opal. Douglas City, Washington. Color, green. Uncut mass. Cat. Nos. b-970; 



83326. Gift of Henry Hedges. 

 Opal. Queretaro, Mexico. Massive piece of fire opal in trachyte. Cat. Nos. l)-972; 



82565. 

 Opal. Queretaro, Mexico. Fire opal in trachyte. Cat. Nos. b-973; 82565. 

 Opal. Queretaro, Mexico. Mass of opal in matrix of reddish trachyte. Cat. Nos. 



l>-974; 82511. The Lea Collection. Gift of Dr. L. T. Chamberlain. 

 Opal. Queretaro, Mexico. Color, bluish. Two small gems. Cabochon cut. Cat. 



Nos. b-98(>-981; 83762. Gift of Miss Knowlton. 

 Opjal. Queretaro, Mexico. Color, blue. Cabochon cut. Cat. Nos. b-982; 50340. 

 Opal. Queretaro, Mexico. Color, white. Two small gems. Cabochon cut. Cat. 



Nos. b-983-984; 51137. 

 Opal. Queretaro, Mexii'o. Color, white. Cabochon cut. Cat. Nos. b-985; 50123. 

 Opal. Queretaro, Mexico. Three gems. Cabochon cut. Cat. Nos. b-986-988; 



50105. 

 Opal. Queretaro, Mexico. Three fire opals. Cabochon cut. Cat. Nos. b-989-991; 



50.341. , 



Opal. Queretaro, Mexico. Five small fire opals. Cabochon cut. Cat. Nos. b-992- 



996; 50339. 

 Opal. Queretaro, Mexico. Five fire opals. Cabochon cut. Cat. Nos. b-997; c-2; 



50337. 

 Opal. Queretaro, Mexico. Six small opals. Milky color. Cabochon cut. Cat. 



Nos. c-3-8; 50340. 

 Opal. Queretaro, Mexico. Five pieces. Color, milky. Calwchon cut. Cat. Nos. 



c-9-13; 50338. 

 Opal. Queretaro, Mexico. Thirteen small gems. Cabochon cut. Cat. Nos. c-14- 



26; 47841. 



