346 TRANSACTIONS OF THE 



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grossular, is found with the copper ore of the Eo^-ers claim, Hope Valley, 

 El Dorado County, and similarly in copper ore at the Mountain Meadows, 

 Los Angeles County. In Russian Amerira, Stickeen Eiver, in finely formed 

 trapezohedral and dodecahedral crystals, imbedded in mica slate, and 

 much resembling 6j)ecimens from Monroe, Connecticut, 



GOJjT)— {Crystalline.) 



Placer County, at Irish Creek, three miles from Coloma, in arborescent 

 and crystalline masses covered with octahedrons. (Eighteen hundred 

 and fifty-four, cabinet of author.) At Forest Hill, in the same county, 

 in tlie placer claims of the Messrs. Deidesheimer, in flattened and dis- 

 torted octahedra. One crystal is a partially formed octahedron, with a 

 rectangular base, one inch long b}^ seven eighths of an inch wide. At 

 Mameluke Hill, near Ceorgetown, in ragged crystalline masses, in a 

 quartz vein. In El Dorado County, at Spanish Dr}^ Diggings, in large 

 masses of irregular dendritic crA^'stallizations. One mass recently 

 obtained weighed about sixteen pounds, and was purchased by Mr. 

 Dickinson, of New York, for preservation. Calaveras County, a large 

 partly formed crystal with octahedral edges ; if perfect, would be two 

 inches in diameter. Tuolumne County, flattened, distorted, octahedrons, 

 from tlie Whiskey Hill Mine. Mariposa County, octahedrons, from the 

 placers near Coulterville, but very rare. At the Princeton Mine, rarely, 

 in nests and bunches of octahedrons, with brilliant faces. 



Small delicate microscopic prisms of gold have been found in the 

 vicinity of Sonora. They appear to be term.inated with crystalline 

 planes at both ends, and probably are elongated octahedrons. (From 

 the collection of Dr. Snell.) 



Crystals of spongiform gold, from one eighth to one quarter of an inch 

 in diameter, and as light, almost, as cork, were washed out by Dr. Hill, 

 from a claim near Angel's. This is a condition of native gold which, it 

 is believed, has not been hitherto noticed. 



In Plumas County, Sherman Lode, Light Cailon, on coatings of green 

 and blue carbonates of copper, proceeding from the decom])osition of 

 variegated copper pyrites or vitreous copper, in part. This gold was 

 apparentl}^ deposited after the deposition of the carbonate of copper. 

 The specimens are beautiful. (Cabinet of Mr. "Waters, Sacramento.) 

 Ilnriposa County, in a narrow vein of calcite, or dolomite, two inches 

 wide, cutting slates; precise locality not known. The gold was in 

 coarse masses and strings, in the middle of the vein. Amadoi^^ County, 

 near Drytown, in a vein of pearl spar, which is very pure and white, 

 and without admixture with quartz or pj-ri'tes. The gold is in coarse 

 masses in the midst of the pearl spar. (Specimens collected by Mr. 

 James, and presented to the author.) 



Gold in small quantities occurs at many places in the Coast Mountains, 

 and associated with cinnabar. Some specimens of coarse gold have been 

 found in the cinnabar veins of Colusa County. In Excelsior District, 

 gold occurs with molybdenite. In San Bernardino County, at the Arma- 

 gosa Mine, in feldspar and in calc spar, in a granitic rock, associated also 

 with arsenolite. 



Many large masses of gold have been taken from the placers of Cali- 

 fornia at various times, of which no authentic record or description has 

 been kept. In eighteen hundred and sixty-four, a large mass, one hun- 

 dred and eighty-seven ounces (fifteen and seven twelfths pounds) was 



