14 GEOLOGICAL SURVEY OF ALABAMA 



tion of the Nyassaland Protectorate, which has produced 

 some little clear sheet ; the remaining Africa mica fields 

 in Rhodesia, Kamerun, and the Protectorate of Southwest 

 Africa, are of no commercial importance. 



Of the Asiatic deposits, the known occurrences outside 

 of India have practically as yet no tangible commercial 

 value. Ceylon, as far as known has an annual output 

 averaging only about 5 short tons, with a reported maxi- 

 in 1907 of 23 tons made up altogether of phlogopite, 

 grade of which has not as yet been demonstrated. 

 Chosen, (Korea) has long produced small amounts of 

 both muscovite and phlogopite, which have been altogeth- 

 er made use of locally. China contains some large de- 

 posits, mainly remote from transportation, but the grade 

 of mica recovered from such deposits as have re- 

 ceived exploitation has been inferior, and the extent and 

 value of existing mica reserves has yet to be altogether 

 proven. 



Japan has as yet no developed mica resources of which 

 any definite knowledge has been obtained, and it is ques- 

 tionable whether such resources exist although reported 

 to be present, in as much as the rapid growth of the elec- 

 trical industry in Japan, which has in recent years chang- 

 ed it as a -nation from an exclusive importer to an ex- 

 porter of electrical goods, would have probably brought 

 about the development of such mica resources if in exist- 

 ence. 



Siberian deposits have recently received some atten- 

 tion, muscovite in the clear sheet, mainly small, but of 

 occasional very large sizes, having been mined, but by 

 reason of climatic drawbacks and remoteness from trans- 

 portation, are hardly to be considered as present sources 

 of supply. 



Australia carries very extensive and workable de- 

 posits of sheet mica mainly in the central part of the is- 

 land, the muscovite recovered being in large, clear sheets 

 of light color, unusually free from flaws or imperfections, 

 sheets running from tw r elve inches to several feet in 

 width having been mined. It has been stated that the 

 Harts Range deposit is one of the largest and most im- 

 portant mica deposits known to exist, although the com- 



