Hidden and Washington—Contributions to Mineralogy. 501 
This iron, as regards markings and general appearance of sec- 
tion, resembles the Scriba and Salt River meteorites more nearly 
than any others represented in the National Museum collection; 
but as no complete analyses of these two irons are at hand the 
chemical comparison cannot well be made. The percentage of 
iron appears rather high, but duplicate determinations gave 
corresponding figures. 
The material for analysis was received by Professor Clarke 
from Messrs. Ward and Howell, of Rochester, N. Y., the pres- 
ent owners of the meteorite, to whom we are indebted for the 
privilege of description. 
Chemical Laboratory of U. 8. Geological Survey, 
Washington, D.C., Feb., 1887. 
Art. LL—Contributions to Mineralogy; by W. E. HippEN 
and H. S. WASHINGTON. 
THE following pages contain the results of a crystallographic 
examination of some crystals obtained last summer at the 
emerald and hiddenite locality in Sharpe’s township, Alex- 
ander Co., North Carolina. The crystals were nearly all highly 
polished and brilliant, allowing very exact determinations. 
The measurements were all made on a Fuess horizontal goni- 
ometer with two telescopes. Asa rule, the mean of about five 
of the best results are taken, though in several cases, as in apa- 
tite and rutile, the fundamental angles selected were the mean 
of ten or more determinations. 
RutTILe.—The particular crystals examined are of the rarest 
type of the region and are peculiar to the pockets and veins 
bearing spodumene. The rare basal plane on the rutile and 
the predominance of the acute rhom- 
bohedron 38£&(x3031) on the associated 
quartz crystals are good indications of 
the gem variety of spodumene in Alex- 
ander County. These rutiles are gener- 
ally quite small, rarely over 3™™ thick 
and 10™" long, but the polish of the 
planes is extremely good. ‘They are 
only found as implanted crystals, and, 
besides the species mentioned above, 
are commonly associated with brown 
muscovite, dolomite, siderite, pyrite, 
and rarely beryl, all well crystallized. The best of these 
crystals came from pockets in the gneissoid rock about thirty 
feet below the surface. With one or two exceptions of clear, 
