244 DESCRIPTIONS OF MINERALS. 
Enstatite. 
Trimetric. JA J=88° 16’. Prismatic cleavage easy. 
Usually possesses a fibrous appearance on the cleavage sur- 
face. Also massive and lamellar. 
Color, grayish, yellowish or greenish-white, or brown. 
Lustre pearly ; often metalloidal in the bronzite variety. 
El sokol er G.corl—ore 
Composition. Me 0, Si=Silica 60, magnesia 40. B.B. in- 
fusible, and insoluble. Bronzite has a portion of the mag- 
nesium replaced by iron. 
Diff. Resembles amphibole and pyroxene, but is infusi- 
ble, and trimetric in crystallization. 
Obs. Occurs in the Vosges; Moravia; Bavaria; Baste, 
in the Hartz; Leiperville and Texas, Pa.; Brewster’s, N. Y. 
Hypersthene is very near bronzite in crystalline form and in com- 
position. It contains a larger percentage of iron, and on being heated 
B.B. on charcoal it becomes magnetic. Occurs at St. Paul’s Island, in 
Labrador; Isle of Skye; in Greenland ; Norway, ete. 
Wollastonite.—Tabular Spar. 
Monoclinic. Rarely in oblique flattened prisms. Usually 
massive, cleaving easily in one direction, and showing a 
lined or ‘indistinctly columnar surface, with a vitreous Justre 
inclining to pearly. 
Usually white, but sometimes tinged with yellow, red or 
brown. ‘Translucent, or rarely subtransparent. Brittle. 
fo A G.=2°75-2°9. | 
aoe Ca Ol ee eine, 52, lime 48=100.  B.B. 
fuses with difficulty to a subtransparent, colorless glass; in 
powder decomposed by hydrochloric acid, and the solution 
gelatinizes on evaporation; often effervesces when treated 
with acid on account of the presence of calcite. 
Diff. Differs from asbestus and tremolite in its more viter- 
ous appearance and fracture, and by its gelatinizing in acid; 
from the zeolites by the absence of water, which all zeolites 
give in a closed tube ; from feldspar in the fibrous appear- 
ance of a cleavage surface and the action of acids. 
Obs, Usually. found in granite or granular limestone ; 
occasionally in basalt or lava. Occurs in Ireland at Dun- 
more Head; at Vesuvius and Capo di Bove; in the Hartz; 
Hungary ; Sweden ; Finland ; Norway. 
At Willsboro’, Lewi is, Diana, and Roger’s Rock, N. Y., 
| 
| 

