340 TRANSACTIONS OF THE 



AGATES AKD CAENELIAK 



Beautiful pebbles of agate and oarnclian are abundant along tbc beach 

 at and near Crescent City. They are much watcr-M'orn, and are generally 

 of light colors. Larger pebbles and more highly colored are abundant 

 in the pebbly drift along the Colorado liiver. Small but very smoothlj'- 

 ■worn specimens of agate and jasper may be picked up on the shores of 

 Lake Tahoe. 



AESENIC. 



Monterey Count}/, at the Alisal mines, twenty-five miles from the Mission 

 of San Carlos. 



AESENICAL-ANTIMONY. 



Ophir Mine, Nevada Territori/. — In reniform, finely erj'stalline, some- 

 what radiated masses, of a color between tin white and iron black, on 

 a fresh fracture, but greyish black from turnishing; associated with 

 arsenolite, calcite, and quartz. — {F. A. Genth, Am. Jour. Sci., (2) xxxiii, 

 190.) 



ARSENOLITE. 



Occurs in large masses, with native gold, at the Armagosa Mine, Great 

 Basin. It is also reported from the Ophir Mine with arsenical anti- 

 mon3^ — (^Genth.) 



ASBESTUS. 



Calaveras County, Salt Spring Yalley, at the Kentucky claim. Los 

 Angeles County (?) in large masses. (From Major Strcebel.) 



AZUEITE— (5?«e Carhonate of Copper.) 



In fine crystalline groups and masses, with malachite, at Hughes' 

 Mine^ Calaveras County. (1861.) 



BIOTITE. 



From the vicinity of Grass Valley. (Cabinet of C. AY. Smith.) 



BITUMEN. 



Occurs abundantly in numerous places in the Coast Mountains, south 

 of San Francisco, but especial!}' south of San Luis Obispo, and in the 

 vicinity of Los Angeles. It is frequentl}^ seen floating in the Santa 

 Barbara channel. It is abundant in Tulare County, on the west side of 

 the Tulare Valley, near Buena Vista and Kern Lakes, and at this and 

 other localities is associated Avith petroleum, (which see.) 



BLENDE. 



Occurs sparingly in many of the gold bearing quartz veins of the 

 State, especially wlien lead is prcst'nt, as, for example, at the Princeton 

 Mine, Mariposa estate; the Adelaide Mine, Ilayward & Chamberlain's 

 Mine, and in several of the Grass Valle}' mines in Nevada County ; at 

 Meadow Lake, in considerable masses, with galena, iron pyiites, and 



