334 New Cobalt Minerals. 
Sulphur} - - - - Mit 
Arsenic, - - - - 47.4 
Scheerer found in two crystals 8.3 and 6.5 parts of cobalt. 
e may name this spieces to distinguish it from the common 
Arsenic-pyrites, cobalt-arsenic-pyrites. 
In all the crystals examined by me, a circumstance was re- 
marked, which Scurerer has not mentioned, that the apparently 
purest and best formed crystals were more or less penetrated with 
clear crystalline quartz, the quantity of which in some specimens 
made up almost a quarter of the weight, in which case the in- 
ternal structure could be seen on the outside. This comming- 
ling remained in all the crystalline portions, even when the whole 
crystal was dissolved in aqua regis. Besides, there remained 
small black spangles, still undissolved, which had altogether the 
appearance of graphite, and are in fact nothing else. I have also 
observed in this undissolved residuum still a third mineral, in 
very hard, brownish yellow, but quite microscopic crystals, which 
is certainly not quartz, but nothing could be determined concern- 
ing its nature. 
_ The second mineral, with limewhite color mingled with lead 
gray, very definitely distinguished from that of arsenical-cobalt, 
and which occurs both compact with scaly grooves and beautifully 
crystallized in tesseral forms, the crystals oftener growing together 
with crystals of cobalt-glance, is arsenical-cobalt with $ more 
arsenic than usual. According to my analysis, it contains, 
Hayrxs of Roxbury, (Vol. xxrv, p. 387, this Journal.) Dr: Dawa describes it a8 
occurring in crystals analogous, if not identical with those of mispickel ; and Mr. 
Hayes found their Sp. Gr, = 6.214, according to the analysis of the latter 1t 
contains, 
Sulphur, - ° : ; ‘ : 4 17.84 
Arsenic, -. - ‘ : st $ : 41.44 
Tron, - - a e - 32.94 
Cobalt, - : ‘ 3 é : ; 6.45 
98.67 
Loss partly iron 
partly iro wee 
Mr. Haves proposed for it, the name of Danaite, Henry examin ; 
scribed numerous forms of this ore from Franconia (see my treatise.) I h pec 32 
no sufficient reason for separating it from mispickel, with which it agrees 1? — 
respect save in the substitution of a small per-centage of cobalt for iron. as 
The second variety of cobalt ore, described by ScHEeRER and WouLER 
not appear to differ from the normal varieties of smalentine Cpe rome 
