124 Scientific Intelligence. 
found in the Erie and Enterprise veins in Monmouth district, Nevada. 
m a notice of Riotte’s paper by H. Credner,* we take the following. 
Crystallization trimetric, J: /==105°; generally in columnar masses or 
foliated, imbedded in quartz. Cleavage brachydiagonal, very perfect. 
Fracture, uneven. .—=4'5. G79. Color brownish-red to brown- 
ish-black. Streak yellowish-brown. Luster adamantine on the cleav- 
. Analysis by 
Riotte and Hiibner gave, WO, 76:4, MnO 23-4. BB. gives reactions for 
both tungstic acid and manganese. Partially soluble in chlorhydric 
acid leaving a yellow residue almost completely soluble in ammonia. 
and gives the density as 7:14. 
11. Mineralogical Notices ; by Wu. P. Buaxe.{—Kerargyrite. Chlo- 
rid of silver occurs in thin crusts on gold-bearing quartz in the Morgan 
gold mine, Carson Hill, Calaveras county. This vein is in the main gol 
belt, and is regarded as a part of the chief gold vein of the state. It is 
noted for the massive specimens of vein gold which it affords. The asso- 
ciation of chlorid of silver with the gold is novel, and has not been before 
observed by myself or others to my knowledge. A little galena occurs 
in the same vein, and in another part of it, gray copper ore, probably 
argentiferous, occurs sparingly and may be the source of the chlorid of 
silver. The crusts are about the thickness of an ordinary visiting card, 
and when freshly cut or scraped have a delicate pearl-gray color, which 
speedily changes to purple in the sunlight. 
This species is also found in remarkably fine specimens in the Poor- 
Poorman lode, as above, is often in masses of several ounces, or even 
pounds, in weight, and it is reported to be occasionally seen in beautiful 
oppe — Th 
found together in the Red Cap claim, Klamath county, Cal., in serpen- 
e. 
‘he m 
phuret, and is sometimes enveloped in red oxyd. Both the copper and 
* Berg. und Hiittenminni Zeitung, xxiv, 370. + Ibid., xxv, 157. 
} A portion of this paper was read before the California Acad. Nat. Sci., Oct- 
om 1866, and another portion bears the date of Nov. 17th. 
pecimens from this well-known locality are contained 
tions in the east.—e. 3. 5. ped 
in many of the collec- 
B “4 
