AUGITE-SYENITE AND GRANITELL. 
123 
Tabulation of the results of a microscopic examination of augite-syenites, &c.—Continued, 
Specimen number. 
1035... 
Place. 
Microscopic char- 
acters. 
Near Baptism ‘Sline| 7] 57 | 7w,! Fine-grained; 
River, 
sota. 
Minne- |S. E. 3! 
highly crystal- 
line; flesh-red; 
appears to be 
mostly made up 
of red feldspars. 
Microscopic descriptions. 
where a finer material, ap- 
parently feldspathic in its 
nature, has mingled with it 
numerous particles of brightly 
polarizing augite. Several 
other similar places present, 
in place of the augite, green- 
ish particles, which revolve 
dark between the crossed 
nicols, and which are proba- 
bly an alteration-product of 
angite. There are also small 
augites filling corners be- 
tween coarser ingredients, 
and even in places lying di- 
rectly within the feldspars. 
The quartz is thickly crowded 
with cavities, many of which 
hold a bubble-bearing fluid. 
Appears to consist entirely of 
feldspar crystals, stained a 
deep-red with oxide of iron 
and completely saturated with 
‘‘graphic” secondary quartz. 
The quartz particles fre- 
quently follow the cleay- 
age lines of the feldspars ; 
and even when not doing so, 
always show a tendency 
toa common direction within 
one feldspar crystal, which 
usually differs from the 
directions in the adjacent 
crystals. Some black, opaque 
clusters, including brightly 
polarizing particles, probably 
represent altered augite. 
None of the feldspars are re- 
cognizable as triclinic, but 
several show the character- 
istio twinning of orthoclase. 
Angle between 
maximum ex- 
tinctions of 
adjacent hemi- 
tropic bands of 
the plagioclase 
in sestions cut 
at random in 
the zone O: ii. 
Angles as 
opposite 
ahi of 
cross-hair. 
= 
2 
im 
ba 
