schaller.] Spodumene from San. Diego County. 275 



Penfleld does not mention the absence or presence of manganese. 

 Otherwise the analysis agree very closely. The results for 

 lithium obtained by the writer are probably a little low. 

 Lithium was separated from the other alkalies by amy] alcohol. 

 The soda fusion had a deep blue-green color and the solution of 

 it in hydrochloric acid had a very decided pinkish cast, affording 

 good qualitative tests for the presence of manganese. Its state 

 of oxidation in the mineral is not known but the absence of any 

 dyads makes it appear more reasonable to consider the manganese 

 as present as Mn ; 0:i, replacing the alumina. Iron is entirely 

 absent, the alumina precipitate being, after ignition, pure white. 

 Neither calcium nor magnesium could be detected. There was 

 no loss on ignition either at a low red heat or at a more intense 

 heat. 



Note. — Since the above was written, short notices of this 

 spodumene have appeared in Science for August 28 and September 

 4, and the gem has been named Kunzite. No detailed descrip- 

 tion of the mineral is given : only a few of the physical properties 

 being mentioned. In both notes twinning structure is mentioned 

 as characteristic of themineral. A careful study of the position 

 of the etch figures has convinced the writer that the specimens 

 which form the subject of this study are untwinned. 



The green spodumene, hiddenite, also occurs in this locality. 

 The writer has recently received from there a small, pale green 

 crystal, about 26 mm. long, 8mm. broad and 7mm. thick. The 

 etch-figures on the prismatic faces show that this crystal is 

 twinned, as some of the etch-figures are in reversed position to 

 the others. 



University of California, 

 September, 1903. 



