149 



Keferred to this axial ratio the observed forms have the 

 following symbols: 



a = {100} , h =- {010}, с = {OOl}, m = {ио], 

 я = {l20}, d={0\\}, б = {03l}. 



Besides these he states the presence of three less certainly 

 determined forms in the vertical zone. 



Among- the elpidite material collected by me microsco- 

 pical crystals like the above-mentioned are by no means rare. 

 They sometimes occur as a hair-like coating on such elpi- 

 dite individuals of larger size as have not been subject to 

 atmospherical action. On individuals that have been for a long 

 time exposed to the open air they are not found. Occasionally 

 elpidite crystals of this kind^'are met with that are rather larger 

 in size than those examined by Nor den sk iö Id. I have ob- 

 served individuals measuring a millimeter or two in length and 

 ^/3™™ in thickness. In the longitudinal zone they are always 

 deeply striated and hardly determinable. 



The largest and most distinctly developed elpidite crystals 

 were found by me at the locality No. 9. At that place large 

 columns, as thick as a man's finger, of common, grey, opaque 

 elpidite occurred in abundance. Some of these individuals had 

 a coating of smaller, well -developed crystals of the same mi- 

 neral. These crystals are up to 6™"^ in length and 1™™ in 

 thickness. They are implanted close to one another in parallel 

 orientation with reference to the larger individual. Some of 

 them are clear and transparent and quite unaltered, but the 

 majority are of an enamel-like opacity. The latter have bright 

 surfaces, but are nevertheless altered throughout. If one tries 

 to detach them, they generally fall into small fragments. 



On some of the clear crystals 1 have made angular measure- 

 ments, and the results that I have obtained may certainly claim 

 a high degree of accuracy. From them it appears that the 

 values obtained by Nordenskiöld are very good considering 



