232 Mineralogical Notices. 
probably somewhat in excess. He infers that the mineral is cube 
or arsenate of peroxyd of iron) containing as impurities 
sulphate of lead and sulphate of iron, 
Copper-Mica of Andreasberg.—Rammelsberg (Pogg. Ann., 
Ixxix, 465) has examined this mineral, before investigated from a 
different locality (Ockerhutte) by Beneke (Pogg. Ann., xli, 333) 
and Borchers, (ib., p. 335,) and first mentioned by Hausmann and 
Stromeyer, (Schw. J., xix, 241,) and has confirmed the analysis 
of Borchers. It occurs mixed with black copper in gold-yellow 
mica-like scales, which separate on subjecting the mass to dilute 
nitric acid. The results of Rammelsberg and Borchers are— 
O Cu Ni 
a Rammelsberg, 18°31 84°63 23°00 22-40—=98°34 
2. Borchers, 18°67 35°16 23:97 21:06=98°86 
or > 
Ou Ni Sb 
43°38 29:23 96°57 
44-28 30°61 
giving the formula R12 8b. Specific gravity 5-783. 
Black oxryd of Copper of Lake Superior.—Rammelsberg states 
(Pogg., lxxx, 287) that this ore afforded Mr. Joy, of Boston, m 
his laboratory, in a pure specimen, 99-45 per cent. of oxyd of cop- 
per; another specimen gave besides oxyd of copper— 
119 Be, 0°23 Oa, 3°38 Si. 
Chalcotrichite (Kupferbliithe).—Kenngott (Min. Unters., p. 31, 
and Lieb. and K., p. 727) describes crystals of chalcotrichite or the 
capillary red copper, both from Nischne-Tagil and Rheinbreiten- 
bach, which pertain to the trimetric system. They occur in rhom- 
bic prisms of 140 to 150 degrees with the edges truncated. This 
oxyd of copper appears therefore to be trimorphous. 
Tin Ore and Gold from Wicklow.—The tin ore occurs with 
gold at the stream-works in the county of Wicklow. W. Mallet . 
obtained on analysis (Trans. Geol. Soc., Dublin, and Phil. Mag., — 
xxxvii, 392) Peroxyd of tin 95-26, peroxyd of iron 2°41, silica 
0:'84=98-51. Platinum is reported from the same region, besides — 
sapphire, topaz, zircon, molybdenite, wolfram, pyrites and other 
iron ores, &c. 
The gold afforded Mr. Mallet, Gold 92-32, silver 6:17, iron 0-78= 
99-27, equivalent to 8} atoms of gold to 1 of silver. Sp. gr. = 16°34 
Trite.—Crystals of Irite in regular octahedrons have been ob- 
served by Kenngott (Min. Unters., i, 61).—They are much flat- 
tened parallel to one of the faces. The true formula of the 
species is probably included under 8 8, which embraces the spinels, 
magnetic iron and some other tesseral species. 
__ Nore.—Errata in the writer’s Mineralogy, third edition—p. 45, 9th 1. from bottom, 
for m’n’ P read m’ P n’—p. 209, Arragoni » anal, for Peli read Be? H®.—p. 211, 
