Geology and Mineralogy. | 239 
Two other analyses are also given; they agree closely with those 
here quoted, varying only as do these in the amounts of soda and 
otash. The calculated formula is H,(H, Na, K), Al,Si,,O,,, which 
requires SiO, 58°46, Al,O, 24:99, Na,O 15°09, H,O 1:46 = 100 
It is shown that the formula is the same as that of spodumene ex- 
reas 
planes, Color greenish-gray to olive-green, also greenish-black ; 
feel greasy. An analysis of the mineral from Chesterfield Hollow 
(G. = 2-623) yielded 
Si0. ALO; FeO MnO (oO MgO CaO Li,O Na,O K.0 H,0 
46°80 3252 233 004 0:04 0-48 O77 032 O78 T24 166 
Organic matter 1°14 = 100°12. 
aq. 
corresponds closely with the Chesterfield mineral. 
In addition to the above pseudomorphs, others after spodumene 
mixed with muscovite and quartz: (4) of quartz; these pseudo- 
morphs are rare, and while retaining the form of the original 
mineral contain more or less mica. The last two forms are men- 
toned as varieties of (1) above. 
r. Julien closes his very interesting paper with some remarks 
on the paragenesis of spodumene and the character of the altera- 
tion which has resatted in the formation of the pseudomorphs 
trina Two figures illustrate the relations of the several 
es, 
erals, in the process of alteration: (3) of albite, generally inter- 
inches across the rism, both terminations being complete. 
; © has also obtained unusually large and perfect crystals of mica 
rom the locality on the west bank of Vrooman Lake, N.S é 
