374 RESEARCH IN CHINA. 
and partly sheared. Several of the albite crystals exhibit this latter 
feature plainly. 
The biotite in No. 32 is olive-green. Certain short brownish prisms 
which are included in crystals of epidote are thought to be allanite. 
Among the iron ores hematite is less abundant than in the red granite 
last described, but on the other hand there is a greater amount of ilmenite, 
which is often surrounded by narrow borders of titanite. 
Light biotitic granite, No. 33.—This is one of the lighter phases of the 
granites of the T’ai-shan. Although it is believed to be younger than the 
gneisses, we have no information regarding its relation to the other granites 
of the complex. Specimen collected about 400 feet, 120 meters, lower in 
the ravine in which No. 32 was taken. 
A pale brownish-gray granite of medium grain and uniform texture. 
Gneissic banding is not visible in this rock. Numerous shining faces prove 
on inspection to be those of glassy feldspars. This mineral, together with 
quartz, constitutes all but a small part of the rock. The remaining acces- 
sories are biotite, chlorite, epidote, and magnetite. 
Three feldspars are present, viz, orthoclase, albite, and microcline. The 
albites are filled with minute inclusions, consisting of saussurite minerals, 
epidote, zoisite, mica, etc. In some of the most altered of these albites 
there are irregular bodies of quartz and limpid fresh microcline feldspar, 
both of which have evidently been produced by changes affecting the 
original albite. The orthoclases, on the other hand, are but little altered; 
while the microcline is always fresh. Some of the orthoclase crystals 
exhibit the structures which have been described under No. 32 as being 
due probably to tensional strains (see Plate LIV, Fig. A). 
The biotite, which is present in small quantity, is very largely altered 
to chlorite and epidote. The epidote also occurs in grains and irregular 
crystals throughout the rock, and is probably the most abundant of all 
the darker minerals. 
Pale epidote gramte, No. 26.—This light-colored granite is merely 
another phase of the younger rocks of the T’ai-shan complex. Its field 
relations were not satisfactorily observed. Specimen collected on the 
summit of the T’ai-shan, at an exposure about 200 feet, 60 meters, west of 
the temple of Confucius. 
This is a rather fine-grained light-colored granite, with a faint reddish 
hue. Greenish blotches, which appear in certain parts of the rocks, are 
epidote and chlorite. There is no visible banding. 
The rock is composed almost entirely of quartz and feldspars. ‘The 
darker minerals are epidote with a little chlorite and iron ores. Apatite, 
and probably allanite, are very rare accessories. 
