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California Art & Nature 



6i 



stone has been reported from the 

 Jaeumba valley, but has not been seen 

 by the writer. 

 JASL-ER— Baja Calfornia. 



JET— A fine b'ack jet, evidently in 

 soTT.e quantity, is reported from the vi- 

 cinity of Santa Fe, New Mexico. 



KALINITE— Alum occurs in ccnsid- 

 eiabls abnridar.ce in the sulp'rur m nes 

 of Baja California, especially in the 

 region of the Cocopah mountains. 



KAOLINITE— The kaolin found at 

 Cajcn mountain, now beins^ indepsnd- 

 ent'y trsted by the owners of the n-im- 

 e ous la ms, as a t;act:)d c ns de abls 

 atteiili'.n, and so far seems to meet 

 ^\ith favor. An analysis by H. Boed:- 

 ker & Co., gave the following resu't: 

 Silica, 62.30 per cent; a'uraina, 20.50 

 per cent; iron (trace) .00 per cent; 

 lime, 2.29 per cent; magnesia, .25 par 

 csnt; v:ater, 11.60 per cent; moistu e, 

 3.10 per cent. Rational analysis: Clay 

 subsLar.ce, 67.2 per cent; feldspar, 15.6 

 pel' cent; cuartz, 17.2 per cent. 



LEPIDOLITE — Lithia mica occurs in 

 an immense deposit near the old mis- 

 sion at Fa'a — probably the largest and 

 richest liihia mine in the world — upon 

 v/Lich about $4,000 were expended in 

 development work during 1899. LHhia 

 of American production — the product 

 of Lhis mine — was for the first time 

 placed upon the market, and thu.s a 

 new A me; Iran industry inaugurated at 

 the close of the century. 



LIG.MTE— A vein 4 feet thick, 12 

 mi'es nofth of San Di go, was reported 

 by Dr. I.e Conte years ago, but seems 

 to have been since lost sight of and re- 

 mains undeveloped. 



LIMESTONE— About 11.5 cubic feet 

 weigh a ton, or 174 pounds to the cubic 

 foot. See calcite. 



LIMONtTE— Elsinore, Cal. 



MAGNETITE— Occurs eight or nine 

 miles north of Mesquite station, on the 

 Colorado desert. I have also found 

 magneuc iron ore in the mountains 

 north of Salton; in the Encantada mine 

 near Alamo (rich in gold), in the Santo 

 Tomas valley, and at San Ysidro, Baja 

 California. 



MALACHITE— Green carbonate of 

 copper, composed of about 71.9 per 

 cent copper oxide, 19.9 per cent car- 

 bonic acid acd 8.2 per cent water, forms 

 the most beautiful of copper ores, at 

 times becoming a semi-precious stone. 



CHREUS HOPPENSTEDTI. 



The finest specimens are probably 

 fcund m the Ural mountains, but mag- 

 cifcent masses have been mined in 

 Arizona, and it usi:aliy occurs in coi> 

 per mines wheie azirite, chry?cs:l a 

 or c!:prite are present, in the C:.laiadJ 

 and Mojave deserts, and in Eaja Cali- 

 forria. 



MICA — The mica of commerce is a 

 form 01 muscovite, but no mine in San 

 Elego county has yet become a p c- 

 duce-. See biotite, lepidoiite, and 

 mus cvi-e. 



JIOLYEPENITE— Composed cf 60 pe • 

 cent mohbderum and 40 per cent cf 

 £U'pbVir; a soft, black ust: ous, fo'iat:d 

 mineral, often mistaken for graphite. 

 Occu's spar ngly in g.anitic veins tea.- 

 the Jamul and Jaeumba valeys and at 

 Ci^mp-. m fan Diego county, and in 

 raja CBliforuia, but not jet known to 

 occur in this region in paying ouanti'y. 

 The United Stales produced this min- 

 eral for the first time commerciary in 



MUSCOVITE— Common throughout 

 the granitic forma. ions. 



ORTHOCLAR.E— Ft-ld.^par is not rare 

 rear Ballena, and occurs at Julian and 

 in Pfja California in considerable 

 c.uEnLiiy, and of a quality sriiable for 

 t] e manufacture of fine wa e. 

 1G8S- -Fibnut 10 tons, wnrth $50 per ton. 



OFS^EIAN— Ee;crt d 'o o; c ir in im- 

 niense quantities near the head of the 



