78 Chemical Examination of Harmotome. 



These constituents induced Stromeyer to infer that Stein- 

 hellite and dichroite, belong to one and the same species ; 

 and in this conclusion mineralogists have generally coincided. 



I got specimens of S'einheilile about fourteen years ago 

 from Mr. Sweden^tjerna, and analyzed it at that time, though 

 1 have not hitherto laid the results before the public. 



The c(»h)r is ulue ; the fracture splintery, and very much 

 like (hat of quartz. 



It is translucent. 



It 's scratched by the knife, and also by quartz. 



Its specific s^raviiy is 2'6032. 



Its constituents were found to be, 



Silica, 52-352 



Alumina, 33-488 



Magnesia, ______ 4*0()0 



Protoxide of iron, _____ 8*556 



Waier, - - J -000 



99-396 



Were we to consider both these analyses as rigidly exact, 

 they would go far to prove that Steinheiliie is not a chemical 

 compound. Would it be too much to consider it as a mix- 

 ture of quartz and dichroite .'' 



28. Hx\RMOTOME. 



Chemists are aware that there are two varieties of har- 

 motome, owe composed of si ica, alumina, barytes, and water j 

 and the other of silica, alutnina, lime, and water. Crystalo- 

 graphers have not hitherto attended to this diversity. It is 

 likely that a difference will be found in the form of the crys- 

 tals of each, and that they will be found to constitute two 

 distinct species. The first of these varieties is found at An- 

 dreasberg, in the Hartz, and in many other places. The lime- 



