FOREIGN OCCURRENCES. 63 
schists at Klausen, in southeastern Tyrol. The same minerals were 
also found associated in the contact zones of the schists and gneisses. 
The corundum is in colorless or bluish crystals of microscopic dimen- 
sions, only the tourmaline, in fact, being- visible to the naked eye. 
CORUNDUM IN TONALITE. 
Zirkel" notes the occurrence of corundum in the tonalite of the 
Eifel, Germany. 
CORUNDUM IN GABBRO. 
Andreas and Konig'' describe an extremely l)asic facies of saus- 
suritic hornblende-gabbro at Frankenstein, (Termany, in which masses 
and streaks of magnetite, sillimanite, and tabular crystals of color- 
less corundum occur in large, allotriomorphic plagioclase feldspars. 
In every way comparable to this is the occurrence of nodules and 
masses of spinel and corundum in coarse, irregular feldspars in the 
somewhat amphibolized gabbro of Veltlin, Germany, described by 
Linck.'- Attention has already been called to the similarity of these 
occurrences to the spinel-emery in the norites of the '' Cortlandt 
series '' of eruptives, in Westchester County, N. Y. 
CORUNDUM IN NEPHELINE-SYENITE AND SYENITE-PEGMATITE. 
In the province of Ontario, Canada, corundum occurs as a primary 
constituent of a series of rocks Avhich vary from a normal syenite 
through a mica, hornblende, and nepheline-syenite ; it is also found in 
a syenite-pegmatite. These syenites vary greatly in size of grain 
and mineralogical composition in different parts of the field, and in 
some cases the syenite masses appear to merge gradually into garnet; 
but when this is the case corundum is absent in the rock. These 
rocks are found in the eastern portion of Ontario in three belts. 
One belt lies to the north and has been traced for a distance of over 
50 miles; to the south of this main belt are two smaller belts, one 
lying to the southwest and the other to the southeast. It is not 
improbable that these two smaller belts are connected with the larger 
belt in some way, perhaps in circular form ; or it may be found that 
they are roughly parallel bands. The three belts taken together 
partly surround a region with a diameter of about 50 miles. These 
rocks have been described by Mr. W. G. Miller and others in the 
various reports of the Geological Survey of Canada and in the reports 
of the Ontario bureau of mines, Toronto. 
Commercial deposits of corundum have thus far been found only in 
the normal syenites Avhich are corundum bearing. In some of the 
« Lehrbuch der Petrographie, 1893, p. 461. 
"Abhandl. Senck. Gesell. Frankfurt, 1SS8. p. 62. 
" Sitzungsber. K. preuss. Akad. Wiss. zu Berlin, vol. 6, 1808, p. 47. 
