2o8 The American Geologist. October, 1900 
membering how small an amount of original mineral was em- 
ployed the per cent of titanic acid must be considerable. Never- 
theless the mineral is not ilmenite or, at least, is not always 
ilmenite, since it occasionally shows good octahedral parting 
and is strongly attracted by a rather weak bar magnet. The 
mineral is, therefore, in large part at least, magnetite, rather 
highly titaniferous, and it is probable that the acicular in- 
clusions are also titaniferous magnetite. 
Liquid inclusions are not common in the material studied, 
though they occur Sparsely scattered throughout the feldspar. 
The pyroxene very often shows the line closely set parting 
lines, parallel to //Xioo), characteristic of diallage. It is along 
these lines that the inclusions are most abundant, though they 
are often placed at right angles to the parting direction, and 
may occur when the parting is absent or only very poorly 
developed. They also occur scattered haphazard throughout 
the pyroxene, then having no definite orientation. These are 
the inclusions characteristic of bronzite, but scarcely less com- 
mon in diallage and hypersthene. They occur as lamellae 
usually lying in the plane /^^ (lOo); in sections perpendicular 
to this plane (e. g. in sections perpendicular to g^ipio) and 
/^^ (lOo), and in sections parallel to^^(oio), they are cut at 
right angles and show a narrow straight edge, looking like 
acicular inclusions. In sections more or less nearly parallel 
to h^{p\6), on the other hand, they show their lamellar char- 
acter; the lamellae, however are decidedly elongated in a direc- 
tion perpendicular to /z^^i(iOo)(oio), and the vertical axis. 
Their outlines as seen in sections nearly parallel to /^^(loo) 
are very irregular, showing none of the ordinary rectangular 
appearance. 
Besides these inclusions, opaque, black needles occur, 
usually parallel with/'(ooi), which seem identical with those 
found in the labradorite and are therefore considered to be 
titaniferous magnetite. In some cases they are apparently 
secondary. No other inclusions have been noted in the 
pyroxene. 
Original inclusions in olivine seem to be very rare; a few 
liquid inclusions have been noted, and certain magnetite 
crystals are apparently primary inclusions. 
The apatite occasionally contains fine grains of a black, 
