. 
816 THE AMERICAN NATURALIST. 
(1) ROEBOURNE. | (2) BALLINoo. | (3) Muncii. | SAN ANGELO. 
PEs e eye 90.914 89.909 90.307 91:958 
Dg a a AT 8.330 8.850 8.230 7-860 
CONE ENA 0.590 0.740 1.360 trace 
Poutia ia 0.156 0.501 0.093 
i OR SS trace trace 0.010 trace 
Shs rue et ete 0.010 trace ? trace? O.O1I 
a kee ae trace trace trace 0.032 
Mie o trace? — = trace? 
Ree N — trace — 0.040 
: 100.00 100.00 100.00 100.00 
Specific Gravity 7.78 7.8 7.4 7.7 
Mineralogical Notes. — Pratt? describes the following minerals 
from North Carolina: Cyanite, from the farm of Tiel Young, Yancey 
County, in large, grass-green crystals showing the forms: 4 oo1 ; 4, 
010; &, 100; m, 110; M, 110; Q, 120; 4, 520; the last new for the 
species. Pale-green cyanite has been found at a number of locali- 
ties in the region named, as well as at Graves Mt., Ga., where it is 
accompanied by rutile. Zircon, from New Stirling, Iredell County, in 
large crystals of pyramidal habit showing the forms: æ, 100 ; m, 110; 
É, 111; v, 2213 x, 311. Anorthite, from Buck Creek, Clay County, 
forming with olivine a mass of troctolite rock, the crystals of feldspar 
varying in size up to an inch and a half long and three-quarters of 
an inch broad. Its specific gravity is 2.699 to 2.744, and its com- 
position almost that of a pure anorthite, as shown by the appended 
analysis. 
Farrington ? describes crystals of datolite from Guanajuato, Mex- 
ico, associated with calcite and quartz. The crystals are small, 
transparent, colorless, faces fairly bright and sharp; 17 forms were 
determined, none of them new to the species. The crystals assume 
three types of habit, one of which closely simulates that of datolite 
from Bergen Hill, described by Dana, being tabular parallel to x, 102. 
One crystal showed a merohedrism simulating inclined-faced hemi- 
hedrism. 
1 Pratt, J. H. Mineralogical Notes on Cyanite, Poon and Anorthite from 
North Poca Am. Journ. Sci., vol. clv (1898), p. 
2 Farrington, O. C. Datolite from Guanajuato. mr p- 285. 
