Mineralogy and Petrography. 1111 
schistose pyroxene rocks, interbedded with archwan gneisses and 
mica-schists. They consist of sphene, garnet, green pyroxene, plagio- 
clase, quartz, mica and pale hornblende in large crystals. Vesuvianite 
and zircon also occur in them in small quantity. The pyroxene, 
comprising the larger part of the rock, is of a light green color, 
and possesses the diallagic parting. The plagioclase—labradorite 
and anorrhite—is present in large quantity in some varieties of 
the rock, and always shows a tendency to alter into wollastonite. 
The hornblende and quartz are both secondary. These pyrox- 
enites resemble very closely the flaser-gabbros of the Germans, 
but are supposed by Barrois! to be metamorposed limestones. 
He describes a limestone in contact with granite in the same 
region, in which the minerals characteristic of the pyroxenites 
have been developed.—Chrustschoff? includes under the name 
perthitophyre a series of dyke rocks occurring in the Department 
Volhynia, Russia, whose characteristics differ from those of any 
rocks heretofore described. They consist of an interstitial micro- 
pesthitic substance, in which various amounts of idiomorphic 
quartz, labradorite, monoclinic and orthorhombic augite, olivine, 
and other minerals are imbedded. In the coarser varieties the 
iron-bearing minerals are not abundant, while in the finer grained 
kinds they are in as large quantity as the feldspar. In the course 
of his article the author describes parallel growths of diallage and 
acicular crystals of an orthorhombic pyroxene, and also an appar- 
ently triclinic pyroxene. He also mentions the existence of anatase 
as an inclusion in the feldspar and quartz, and gives in brief the 
properties of a mineral whose nature he is unable to determine.— 
Sandberger’ describes inclusions of hypersthenite, olivine-gabbro, 
and a rock composed of olivine, arfvedsonite, picotite, eustatite, 
sanidine and augite, from the phenolite of Heldburg, in the Thür- 
inger Wald.—Posepuy * gives brief descriptions of a few sections 
of adniole in the course of an article discussing the structure of the 
well-known mining region in the vicinity of Przibram, Bohemia. 
AMERICAN Mryerats.—A series of analyses’ of beryl from 
Norway, Maine and Willemantic and Litchfield counties, Ct., seems 
to show that beryllium and the alkalies mutually replace each other 
in this mineral, and that water is a constant constituent. An 
analysis of phenacite from Florissant, Col., gave practically no 
alkalies, The barium feldspar (cassinite) from Bene Hill, Delaware 
- county, Pa., first analyzed by Genth,® has been re-examined by 
z s: Ann. d. 1. Soc. Geol. du Nord., xv., p. 69. 
* Miner. und Petrog. Mitth., ix., p. 470. 
