160 Scientific Intelligence. 
rutile, tourmaline, spodumene, and siderite. Other crystals con- 
tain flu id cavities. OrTHocLASE occurs in large well-formed 
crystals (one weighed 40 lbs.) on the Price and Keever lands in 
a coarse gran nitic vein, associated with beryl, ritcsdewesee colum- 
bite, autunite, mica. Tourmatine in fine brown-black crystals 
are found in the Price mine, also brilliant back crystals at B. 
Lyon’s. In addition to the minerals already named, graphite, 
2 Soon magnetite also occur in the count 
0. Analysis of boners Jrom the Vulture mine, Arizona; by 
S.F-Prs NFIBLD, (Communicated).—The occurrence of jarosite with 
gold in the Vulture mine, ee rizona, has been mentioned by Prof. 
B. Silliman (this Journal, xviii, 73, 1879). The variety analyzed 
is found in minute transparent crystals of a brownish-yellow color. 
It forms a frosted coating on cellular quartz, giving to the speci- 
men a somewhat rusty look ; under the microscope, however, the 
coating is resolved into distinct individual crystals, delicately 
grouped together. The crystals are tabular in habit, being a com- 
bination of the basal and rhombohedral planes; the angle of OA 
was measured approximately and the result agreed with that 
siti accepted (1243°). 
The mineral is slightly eee in water, the solution giving 4 
reaction feos sulphuric acid but not for iron, An analysis on ma 
terial free from acy Aeaaie a little quartz, gave :— 
Fe.0; K,0 Na,.O 4.0 Qua 
Sp. gravity=3-09. 30-42 48°27 8°53 0°28 12°91 Be ote =101° 49 
The calculated ratio for SO; : FesO;: K,0(Na.0): H,O=4: 3°18: 0°99: 7°55. 
The water determination is probably ere in error; if the 
amount be determined by difference (=11°42), the result differs 
DH Ke, from the ratio required by the formula K,SO,+Fe,5,0,, 
21. Jarosite from Colorado.—Dr. G. A. Kinte has recently de- 
scribed jarosite from the Iron Arrow Mine, Chaffee Co., Colorado. 
It occurs in seams and cavities in a siliceous tur gite and hematite. 
It is found in minute brilliant crystals (2 with 0) isolated, also in 
groups and in crystalline crusts. The crystals are transparent, 
a li 
cific gravity =3°144, An 86a, a afforded 
Os Fe.0, K,0 Na,O H SiO. 
28°57 6110 713 0°34 10°56 240  =100°80 
Rejecting the silica as an impurity, also 8-7 p. c. turgite (Fe, H,0,), 
the remainder is found to correspond to 89°6 c. of jarosite 
ia trees oa Ave | +Fe,S,0.,+2H,Fe,0,) with “4 As ce. water 
in excess, —F¥06 cad. N at Sci. co 1880, p. 3 
gravels of Brindletown in the summer of 1879. Subseque ah 
search in the vicinity bie proved its distribution through all the 
