Review of Recent Geological Literature. 393 
REVIEW OF RECENT GEOLOGICAL 
LITERATURE. 
Scapolite Rocks from Alaska ;\>y J. E. Spurr. (Am. J. Sci., 160- 
310-315)- 
The first rock described is an andesine-oligoclase-scapolite-biotite 
rock of granitoid texture, occurring in the form of great dikes cutting 
through an older igneous rock — granite and dioryte. The scapoh'te is 
considered the equivalent of a feldspar in the rock and the latter is 
placed parallel to the belugyte group of feldspar rocks as a scapolite 
belugyte. The name yentnyte is suggested and the type becomes 
"a biotite yentnyte. A local variation of this rock is described as mi- 
crocline scapolitic. The second rock, a light colored dike rock cutting 
Cretaceous shales and limestones, is described as a quartz-scapolite 
porphyry and is placed parallel to the quartz monzonyte group of 
feldspar rocks. It is given the name of kuskyte. The author is of the 
opinion that the gasses — chlorine, etc. — played an important part in the 
formation of the scapolite; but he considers the latter to be undoubtedly 
an original constituent and not of secondary origin as is probably the 
case with the Norwegian scapolite rocks. C.H. w. 
Graftonite, a New Mineral from Grafton, N. H., and its Inter- 
growth with Triphylite; by S. L. Penfield. (Am. J. Sci., /60-20-32). 
The new mineral occurrs in a coarsely crystalline pegmatitic vein 
of quartz and feldspar. Its composition as shown by chemical analysis 
is represented by the formula R "aP^Og, where R' ' represents the iso- 
morphus elements iron, manganese and calcium in varying proportions. 
This places it in the rare group of anhydrous, normal phosphates of 
which triphylite is also a member. The latter occurs in thin, dark 
layers distinctly interlaminated with the light colored graftonite. Mi- 
croscopical examination brings out the interesting fact that the two 
minerals have a definite crystallographic orientation with respect to 
each other. Apparantly, graftonite, which constitutes something over 
two-thirds of the whole mass, was in sufficient quantity to give its own 
monoclinic symmety to the crystals and at the same time by reason of 
some similarity of molecular structure, has caused the laminae of the or- 
thorhombic triphylite to take a definite crystallographic orientation. 
These relations and the crystal habit are shown by appr()[)riale draw- 
ings, c. H. w. 
Two New Occurrences of Corundum in North Carolina ;h\ J. H. 
Pratt. (Am. J. Sci., /(5o-2q5-2q8). 
The first occurrence is in an amphibole schist apparently a meta- 
morphosed igneous rock of the gabbro type. The corundum is found 
in seams a few feet in width, and forms about 10 per cent of tin- vein. 
The second is in a quartz schist, composed of biotite mica and cpiartz in 
which the corundum is found along streaks or bands. It is thought 
that the excess of alumina contained in the original shales, which were 
afterwards metamorphosed intocjuartz schist, crystallized out along the 
planes of lamination. c. 11. w. 
