390 On SODALITE, a new 
as ftated by Havy, are fimilar to thofe of the mineral to which 
I have given the name of Sodalite. The conftituents of fett- 
ftein, as afcertained by VauQUELIN, are as follows : % 
Silica, = - - 44.00 
Alumina, - _ 34.00 
Oxide of iron, - - 4.00 
Lime, “ 5 f 0.12 
Potafh and foda, - - 16.50 
Lofs, sd - - 1.38 
100.00 
II. DescrirpTION OF SODALITE. 
SopALITE, as has been already mentioned, occurs in a pri- 
mitive rock, mixed with fahlite, augite *, hornblende, and gar- 
net +. 
Ir occurs maflive ; and cryftallifed, in rhomboidal dodecahe- - 
drons, which, in fome cafes, are lengthened, forming fix-fided 
prifms, terminated by trihedral pyramids. 
Irs colour is’ intermediate between celandine and mountain 
ereen, varying in intenfity im different {pecimens. In fome 
cafes it feems intimately mixed with particles of fahlite, which 
doubtlefs modify the colour. a 
ExTernaL luftre glimmering, internal fhining, in one direc- 
tion vitreous, in another refinous. 
Fracture foliated, with at leaft a double deuaek 3 crofs 
fracture conchoidal. 
FRAGMENTS indeterminate; ufually fharp-edged. : 
TRANSLUCENT. 
* Turs fituation of the augite deferves attention. Hitherto it has been, 
with a few exceptions, found only in fleetz trap rocks. 
+ Tue particular colour and appearance of this garnet, fhews that the rock 
came from Greenland: For fimilar garnet has never been obferved, except in 
fpecimens from Greenland. 
