ELISHA MITCHEIvL SICE^NTIFIC SOCIETY. 43 



than was formerly supposed. Thus Derby, "'^ by exam- 

 ining- the heavy residues of a number of hand speci- 

 mens, selected at random from the collection in the 

 National Museum at Washing-ton, D. C, described the 

 occurrence of monazite in certain granites and gneisses 

 of Maine, New Hampshire, Rhode Island and Massa- 

 chusetts. 



In Norway, Silesia and Bohemia, and in some of the 

 mica mines of Canada, Virginia and North Carolina, 

 monazite has been found in pegmatite dikes. Derby 

 has found the mineral in a red s^^enite at Serra do 

 Stauba, in the province of Bahia, Brazil. The turner- 

 ite of the Saacher Lee (which is an extinct volcanic 

 crater) near Coblenz, in Prussia, was found in a druse 

 in a sanadine bomb, the only known occurrence of mo- 

 nazite in an undoubted volcanic rock. 



The turnerite of Olivone, Switzerland, occurs in a 

 quartz vein 20 to 30 cm. wide, traversing- crystalline 

 schists. 



The cryptolite of Norway occurs as inclusions of 

 very fine, needle-shaped crystals in apatite. 



In Cleveland County, N. C, monazite has been found 

 intergrown in cyanite. 



The percentage of monazite in these rocks is exceed- 

 ingly small, often infinitesimal; thus Derby"" states that 

 the g-ranite dikes of Serra de Tingua, near Rio, are 

 rich in the yellow mineral, carrying 0.02 to 0.03 per 

 cent, and a fine-grained granite dike on the outskirts 

 of Rio de Janeiro, showed 0.07 per cent monazite. 



Monazite has not been found in the sedimentary rocks, 

 although it may be i)resent in some of these as a sec- 

 ondary mineral of transportation. 



* Proc. Rochester Acad. Sci., vol. I, 1891, p. 294. 



* Proo. Rochester Acad. Sci. vol, I, 1891, p. 294. 



