OCCURKENCE AT OTHER LOCALITIES 285 



13. Gabbro (Harz). 



14. Syenite (Norway). 



15. Granite (Schlasien, Bohmen, Bayern, England, Norway, Ceylon, Tas- 



mania, New South Wales, Victoria, and various parts of Canada 

 and the United States). 



This last named occurrence— that is, with granite— is by far the most 

 usual and typical. 



A CCOMPA N YING MINERALS 



The mineral association is not less varied than its petrographical rela- 

 tionships. It is associated with the following minerals, arranged in 

 mineralogical order: Silver and gold, sphalerite, pyrrhotite, pyrite, bor- 

 nite, chalcopyrite, arsenopyrite, fluorite, quartz, magnetite, cassiterite, 

 rutile, calcite, orthoclase, oligoclase, pyroxene, tremolite, hornblende, 

 garnet, scapolite, zircon, tourmaline, muscovite, biotite, apatite, barite, 

 wolframite, scheelite — some thirty minerals in all. 



The association with sulfides and oxides is that most characteristic of 

 the occurrence in quantity in veins. The association with carbonates 

 and silicates is that shown by particles disseminated in rock masses. 



FORM OF DEPOSITS 



The form of the deposit shows some variety, inasmuch as the mineral 

 under consideration is found in rifts, impregnations, in quartz druses, 

 in beds and lenses, in beds of magnetite, in copper and cassiterite veins, 

 in veins of compact tremolite, and in veins of fluorite, barite, and most 

 commonly quartz. Lacroix f says that molybdenite is rarely found in 

 metalliferous veins. 



Location of Crown Point Mine 



Chelan county is a little north of the center of Washington. Through 

 it from southeast to northwest stretches lake Chelan for about 60 miles 

 in a narrow rock gorge from 2 to 4 miles in width. In many places the 

 banks are so steep that a fisherman could not find standing room. The 

 mountains rise 5,000 feet or more above the lake. In rugged beauty 

 this lake is probably unsurpassed by any of the lakes of North America. 

 Its picturesqueness has been well described by Russell. J 



*An extended list of localities is given in Hintze's Handbuch der Mineralogie, i. See also : 



Lacroix : Min. de 1. France, tome 2, p. 461. 



Mugge : N. Jahrbuch, 1898, i, p. 109. 



Chelsius : N. Jahrbuch, 1902, i, p. 336. 



Bell : Transactions Am. Inst. Mining Engineers, xiv, p. 692. 



American Journal of Science, 1886, 1889, 1898. 



t Mineralogie de la France, 2, p. 461. 



J I. C Russell : Lakes and Rivers of North America. 



