JULIEN, DETERMINATION OF MINERAL CONSTITUTION 145 



In this however the descriptive data are not sufBcient to determine the 

 exact condition of the alumina (as bauxite? or as a hydrosihcate?). 



'Genthite." 



From Texas, Pennsylvania, etc. Analysis by Genth, from Avhich it has 

 been pronounced "a gymnite, with part of the magnesium replaced by 

 nickel: 2NiO. 2MgO. SSiOj. 6H2O," or R,^ Mga NijSig O, 



'16* 



"Xylotile" (Mountain-wood). 



From Schneeberg, Tyrol. Average of three analyses by Hauer, after 

 exclusion of water lost at 100° C. Probably an altered chrysotile (Kenngott). 



"A very ferruginous chrysotile, of which part of the iron has been 

 oxydized by secondary processes" (Lacroix). 



According to Liebe, it has been probably derived from alteration of 

 "diabantachronnyn," 



