350 TRANSACTIONS OP THE 



. MANGANESE, OXYD. 

 (See Pyrolusite.) 

 MANGANESE, CAEBONATE OF. 



(See DiALLOGITE.) 



MEECUEY. 



Native quicksilver is found in Napa (?) County^ near the Geysers, at 

 the Pioneer Claim, in a silicious rock. 



(For sulphuret of mercury, see Cinnabar.) 



MEECUEY, IODIDE OF. 



Santa Barbara Count?/, (Mr. G. E. Moore.) 



MISPICKEL. 



Grass Yalley, Xevacla County, at the Betsey Mine, with gold. This 

 mineral is a common associate of gold in the quartz veins of the State. 

 Crystals of mispickel are sometimes penetrated with gold. 



MOLYBDATE OF LEAD. 



Sttate of Nevada, Comstock lode, in the upper part of the California 

 Mine, in the " rusty lode," in small j^ellow crystals; in good crystals in 

 the (?) Miiie, Weaver District, Arizona. 



MOLYBDENITE. 



Occurs in fine specimens at several localities in the gold region; 

 Nevada County, at the Excelsior Mine, Excelsior District, abundantly 

 with gold. 



MOUNTAIN COEK. 



Tuolumne County. 



NICKEL. 



(See Emerald Nickel.) 



OETHOCLASE. 



San Diego County, in granitic veins along the road between Santa Isabel 

 and San Pasquale, associated with tourmalines and garnet. Fresno 

 County, at Fort Miller, in coarse grained granite, under the edge of the 

 lava plateau. 



OPAL— SEMI OPAL. 



A white milkj^ variety of opal is found in Calaveras County, at Mo"kel- 

 nmneHill, or on the hill near tiiat place, known as Stockton Hill, on the 

 west side of Chile Gulch. A shaft has been sunk there three hundred 

 and forty-five feet, and the opals are found in a thin stratum of red gravel. 



