Intelligence and Miscellaneous Articles. 531 



ALBITE. 



An analysis of albite made by Erdmann from the neighbourhood 

 of Brevig in Norway, gave the following results : — 



Oxvgen. 



SUica 6911 35-89 12 



Alumina 19"34 1 g..29 3 



Oxide of iron. . . . 0*62 / 



Soda 10-98 \ .^.gg j 



Potash 0-65 ; " 



Oxide of manganese 1^^^^ 

 Magnesia ... .... J 



100-70 



Formula „ S3 + 3 A S. 



K 



LEUCOPHAN. 



Tliis mineral has been analysed by M. Erdmann of Sweden. It 

 is found on a rock in the sea called Lamnion or Lammanskarett, at 

 the mouth of the Langesundsfjord in Norway. It is imbedded in 

 sienite on the west side of the cliiF, accompanied by aegirine, albite, 

 elccolite, grains of yttrotantalite, and another new mineral which 

 M. Erdmann has named mosandrite. It is difficult to obtain it. 



It is seldom found regularly crystalHzed ; it has three distinct 

 cleavages. L. J. WaUmark has examined the form of the crystals. 

 A four-sided prism may be obtained, measuring 53° 24-7' and 36° 

 26-3'. The colour varies from a pale dirty green to a wine-yel- 

 low ; thin fragments are transparent and colourless. The clea- 

 vage planes are brilHant. Gives a white powder, and has great tena- 

 city, and gives out a blue phosphorescence on hammering as well as 

 by heat. On heating, is shghtly electric. It is rather less hard 

 than fluor spar, sp.gr. = 2-974. Melts before the blowpipe into 

 a clear bead of a shght violet colour ; with salt of phosphorus it is 

 dissolved, leaving a residue of silica ; with borax it is easily dis- 

 solved ; with a small quantity of soda it gives an opake bead, not 

 absorbed by charcoal. It gives out fiuosilicic acid when heated in a 

 tube with salt of phosphorus. It is composed of 



Oxygen. Calculated. 



•82 24-84 .. 7 49-20 



•51 3-58 .. 1 11-73 



Silica 47 



Glucina 11 



Lime 25 



Protoxide of manganese 1 



Potash 



Soda 7 



Fluorine 6 



This gives the formula 



01 / • • • T -^ '^ ■ \ r04 



2Gi f 0-16 



59 \ 2 ..<^ 7-10 



17 J L 5-67 



2NaFl-|-GSi-f6CaSi,or2NFl+3(GS -1-2083). 



MOSANDRITE. 

 This mineral was found accompanying lcucoi)han, and has been 

 2 N2 



