STATE AGRICULTURAL SOCIETY. 349 



City for steam boilers ; Savta Barbara Counfi/, Humboldt County^ along the 

 Eei Kiver; Klamath County, at Gold Bluff, four hundred feet below the 

 surface. (Lieut. Tattle, U. S. A.) Drl Norte County, at Point St. George. 

 (Prof. Sherman Day.) In Nevada, Wat^hoe County, along the Truckee 

 liiver; in Lyon County, at the " Whitman Mines." 



LIxAIONITE. 



Mariposa County, at Burns' Creek, near the old road to Fort Miller, in 

 a heavy outcrop of quartz; solitl blocks of limonite, from two to four 

 feet thick, are found there. (See Gcol. Rec. Cal., p. 290.) Oregon, sixteen 

 miles from Portland, in an extensive bed; specimens were sent by Gov- 

 ernor Gibbs to the Mechanics' Fair exhibition in eighteen hundred and 

 sixtj'-four. 



MACLE. 



3fariposa County. (See Andalusite.) 



MAGIn ESITE— ( Carbonate of Magnesia.) 



Tidare County, near Yisalia, between Four Creeks and Moore's Creek, 

 in the foothills, in solid beds of ])ure white, massive carbonate of magne- 

 sia, hard, fine-grained, and like unglazed porcelain in texture. The beds 

 are from one to six feet thick, and ai-e interstratified with talcose slates 

 and serpentine. Similar beds are described to me as existing in the 

 Diablo range, Alameda County, about thirty miles south of the mountain. 

 Mariposa County and Tuolumne County; a heavy bed of magnesian rock, 

 chiefly magnesite, charged with crystals of iron pj^rites, accompanies the 

 chief gold bearing quartz vein of those counties. This I'ock is charged 

 also with nickel and chrome talc in green films, like the magnesite of 

 Canada. 



MAGNETITE. 



In large beds, massive, and of superior quality, in Sierra County ; also 

 in octahedral cr3'stals, forming beautiful cabinet specimens. In Plumas 

 County, near the line, fine groups of octahedrons associated with garnet (?) 

 and epidote. (?) Mariposa. County, just east of the Mariposa Estate, on 

 the ti'ail to Yosemite. Placer County, at Utt's Eanch, six miles from 

 Auburn. At the Caflada do las Uvas, Los Angeles County, in a vein about 

 three feet thick, in limestone; in the syenitic granite of the mountains 

 between the Great Basin and Los Angeles; seen in drift fragments in 

 tlie Valley of Soledad, or " Williams(;n's Pass." El Dorado County, nt 

 Yolcanoville, on the Middle Fork of the American Eiver, near the great 

 quartz vein. This locality was noted bjMhe writer in eighteen hundred 

 and fifty-three. This ore is, perhaps, titaniferous, but specimens ai'c not 

 at hand for examination. Trinity County, near Weaverville, in small veins. 

 (Trask, 3d Eeport, 1865, p. 56.) Ncrada County, three miles from Grass 

 Valley. El Dorado County, fine octahedral crystals, in slate, near the 

 Boston Copper Mine; in small brilliant crystals, with quartz, jjyrites, 

 and calc spar, at the El Dorado Excelsior Copper Claim. 



MALACHITE — (^Green carbonate of coj^per.) 



In remarkably fine specimens, associated witli crystalline blue car- 

 bonate, at Hughes' Mine, Calaveras County, (1861.) 



