ELIZABETH TOW -V AND TORT HENRY QUADRANGLES 1 53 



hornblende, orthoclase, quartz of the rose variety, phlogopite, pla- 

 gioclase, rutile, titanite, tourmahne, wernerite, woUastonite. 



3 Minerals of the nontitaniferous iron mines. These are of two 

 groups, according as they occur in the ore or in the associated 

 pegmatites or pegmatitic segregations. In the ore proper, there is 

 little beyond magnetite, apatite^ calcite, hematite, molybdenite, and 

 siderite, deserving comment and most of these are unusual. The 

 interesting minerals are in the pegmatites and the list is quite large, 

 albite, allanite, amphibole, apatite, arsenopyrite, . biotite, fluorite, 

 garnet, lanthanite, magnetite, molybdenite, pyrite, pyroxene, quartz, 

 titanite, wernerite, zircon. 



4 Minerals of the titaniferous iron deposits, ilmenite, magnetite. 

 The above species will now be taken up in alphabetical order 



with comments on the occurrence. 



Albite. In 1895 or 1896 the workings in the great pit of Mine 

 " 21," encountered a large and coarsely crystalline pegmatite dike. 

 Many carloads of this rock were brought to the surface, of which 

 a comparatively small part is still accessible in the easternmost 

 dump along the main track toward Port Henry. From the peg- 

 matite, cleavage masses of striated and slightly greenish feldspar 

 can sometimes be obtained. Cleavage flakes parallel with the base, 

 give an extinction from parallelism to 3 degrees. On the brachy- 

 pinacoid the extinction reaches 15 degrees. Prof. William Hallock 

 determined the specific gravity of a piece weighing about 55 grams 

 to be 2.61S2 at 14.5° C. This is slightly below the general aver- 

 cigt (2.62) of albite, but undoubtedly the albite molecule predomi- 

 r-ated in the piece. Still the general appearance, depending as it 

 does on the greenish hue and the coarse striations, reminds one 

 rather of oligoclase. 



Allanite. This mineral, usually esteemed a rare one, is present 

 in unusual amount and has afforded some crystals of exceptional 

 size and perfection. Allanite from this locality was first announced 

 by W. P. Blake in the -American Journal of Science, September 

 1858, page 245. The occurrence was in the Sanford bed, or as 

 we now call it, the " Old Bed," the one just north of ''21 " and 

 at present not much worked. Allanite crystals 8 or 10 inches long, 

 6 or 8 inches broad, and ^ inch thick are cited. The particular 

 rock mass containing them was apparently long since exhausted, 

 but one may still find small allanites in the pegmatitic streaks of 

 this old pit. James Hall secured one of the large and very perfect 

 ones in the early days and placed it in the hands of E. S. Dana 

 by whom it was described in the American Journal of Science for 



