410 F. A. Genth’s Contributions to Mineralogy. : 
Art. XLIV.—Contributions to Mineralogy; by Dr. F. A. Gent 
of Philadelphia. 
1. Pyrophyllite. 
Tuts interesting mineral was reported by Prof. C. U. Shepard 
to occur near Crowder’s Mountain in North Carolina; the exact 
field District, S.C. 
B.B. it exfoliates into a fan-like opaque white mass of more 
than twenty times its original bulk ; fuses with great difficulty 
into a white blebby slag. The lustre of the N.C. specimens 1s 
he following are the results of my analyses : 
Silica, . : : : . 6482 66°01 
Alumina, . : : ; 28°48 28°52 
Sesquioxyd of iron, . ; . 0°96 087 
Magnesia, . ‘ s . 0°33 0°18 
ime, . ; : ; . » 065 023 
Water, ‘ : : 5°25 522 
2. Chrysotile. 
The beautiful fibrous mineral of a yellowish white color and 
silky lustre, which occurs in small veins in serpentine at Abbotts- 
ille, N. J., has been examined by Mr. Edwin L. Reakirt. — 
-B. it whitens, becomes brittle and fuses with difficulty into 4 
white slag; with cobalt solution, flesh-colored. It contains: 
Silica, 5 : : . . 42:52 42°72 
Alumina, . : : not det. 0°38 
Sesquioxyd of iron, , : - not det. 030 
agnesia, + Gees ; 42°35 42°99 
Water, _ Pie, ee 14°18 
. 3. Scolecite, 
Lyman Wilder, Esq., of Hoosick Falls, N. Y., kindly furnished 
me with the material for analysis of a mineral from the East In- 
dies. It consisted of globular masses 5 to 6 inches in diameter of a 
radiated structure. Sometimes there was found between the radii, 
which have a vitreous lustre, the same mineral of a reticulated 
Structure with pearly lustre. 
B.B. it fuses with intumescence easily toa blebby glass. Mr. 
Wm. J. Taylor analyzed it and found it to contain: 
