1853.] 297 
sulphuric acid was then passed through the solution, which precipitated sul- 
phides of copper, of arsenic and of antimony. ‘This precipitate was filtered and 
treated with sulphide of ammonium. The remaining sulphide of copper was 
oxydized by nitric acid, and the oxide precipitated by caustic potash. It gave 
0.0512 grs. 
The solution containing antimony and arsenic was boiled with hydrochloric 
acid and chlorate of potash, then tartaric acid, an excess of chloride of ammo- 
nium and ammonia added, and the arsenic acid precipitated by sulphate of mag- 
nesia as arseniate of magnesia and ammonia. From the quantity of magnesia in 
this double salt the arsenic was found by calculation. The weight of magnesia 
was 0.0082 grs. The filtrate from the sulphides of copper, arsenic and antimony 
was oxydized by nitric acid, and the sesquioxide of iron precipitated by ammo- 
nia; it was 0.0027 grs.; the zinc was thrown down from the filtrate of iron by 
sulphide of ammonium, and gave 0.0042 grs. oxide of zinc. 
Sulphur and antimony were determined from the loss, and by calculation. 
On Owentie, a new Mineral. 
By Dr. F. A. Genta. 
Formula.—2(3RO, SiOz )+-(3R20s, SiO3)+ 6HO. 
Massive; aggregate of minute scales; cleavage distinct in one direction. 
H. = 2:5; Sp. Gr. (at 20° C.) = 3-197; lustre pearly; color olive green; 
streak paler; very tough; fracture subconchoidal; the powder greasy to the 
touch; odor argillaceous. 
B.B. fuses easily = 3; and gives an iron-black magnetic globule; with borax 
gives the reactions of iron, and with soda slightly those of manganese. Yields 
water in the matrass. Dissolves in hydrochloric acid. 
Mr. Peter Keyser has analysed it in my laboratory, and found the following 
composition : 
Is 1M Mean. Contains Oxygen. 
Silicie Acid $ 6 POU(OT 23°317 23°21 12°05 
Sesquioxide of Iron . 13-895 13-881 13-89 4:16 2 
Alumina .- .  . 15-532 15-642 15-59 Hoe 11-45 
Oxide of Iron . : 34°578 34°58 7°68 ) 
Oxide of Manganese . trace. | 
Magnesia . é 5) lbalayy) LOBs7/Al 1:26 0-49 | 
Lime Sire eens 30. 286 0-431 0:36 0-10 ¢ 8°39 
Soda Habitat siksbing 0-410 0-41 0-11 | 
Potash é : . 0-076 0-08 0-01 J 
Water : : - 10-835 10°354 10°59 9-42 
99-872 100-069 
Found at Harper’s Ferry, Virginia, in metamorphic rocks with quartz. It 
has impressions of Dolomite. 
The name is given in honor of D. D. Owen, M. D., U.S. Geologist. 
The ratio of the oxygen of RO : R,O, : SiO; : HO, is: 
soa) 8 Mostyn sy aks) a Coz} 
a elsSO rn Mc4ori ime 2 on very near 
‘lo: 1:50 : 1:50 : 1:00, corresponding with the formula 
2 (3 RO, SiO,) +-(3 R203, SiO) +6 HO. 
The Owenite is closely allied to some other minerals, viz. Aphrosiderite and 
Thuringite. All three resemble each other very much, and only by chemical 
examination their difference can be detected. 
_ Aphrosiderite is a mineral not generally known; found at several localities 
in Nassau, and first distinguished from earthy chlorite by Fridolin Sandberger, 
