462 RESEARCH IN CHINA. 
fels is composed entirely of chlorite, which appears homogeneous in ordi- 
nary light, but polarizes in very irregular fashion. Between crossed nicols 
the beautiful ultra-blue color is very prominent and distinctive. The exact 
line of contact between the igneous rock and the hornfels is usually dis- 
colored by yellowish-brown matter. 
Within a few centimeters of the syenite long tubular stringers of 
quartz and prisms of zoisite extend radially out into the country rock; 
the former are very conspicuous in the hand-specimen. Smaller crystals 
of zoisite and hornblende are clustered along the contact or lie embedded 
in the chloritic mass. Most of these show plainly by the bent crystals and 
strong undulatory extinction that they have been subjected to intense 
strain. This is perhaps a result of the pressure exerted on the surround- 
ing rock by the advance of the intruded magma. The lacerated edges of 
the hornfels, the shear-zones in the quartz and the repeated cross-fractures 
parallel to the contact are possibly to be explained by the “‘drag”’ of the 
still viscous body of the lava, the extreme edges of which had already 
solidified. One thing at least is clear, viz, that the quartz tubules are 
genetically connected with the intrusion of the syenite, for they are not 
present anywhere except along its immediate boundaries. 
Schistose greenstone, No. 126.*—This greenstone forms a large mass of 
unknown extent, which has apparently been intruded into the Paleozoic 
sedimentary formations about 7 miles, 11 kilometers, west of Shi-ts’tian- 
hién, on the Han river. The mass is greatly decayed and is so thoroughly 
broken by intricate systems of joints that it is difficult to obtain a satis- 
factory specimen of the rock. 
Specimen from the south bank of the Han river, 7 miles, 11 kilometers, 
above Shi-ts’tian-hién. 
The rock is dark greenish-gray, massive and aphanitic in texture. 
The hand-specimen exhibits no definite structural peculiarities, for in spite 
of its schistose microstructure it shows no tendency to cleave along paral- 
lel planes, but breaks up in the irregular manner which is so characteristic 
of greenstones generally. 
The rock is very fine-grained and consists largely of pale-green horn- 
blende with quartz and probably feldspar. Pyrite and magnetite are 
common although not abundant accessories, while zoisite and epidote are 
also present in considerable quantities. 
A minute schistose structure is prominent in the thin sections. The 
smaller and more fibrous crystals possess a parallel arrangement and in- 
close larger lenticular bodies or ‘‘augen.’’ The schistose lines are wavy 

*According to Van Hise, this would be a hornblende dolerite, but the term here used is preferred on 
account of the fact that it is non-committal in regard to the origin of the rock. 
