SF nN ee eee hy ee a ne Seed 
Dr. Genth’s Contributions to Mineralogy. 17 
(from 280 feet below the surface) sometimes contained a steel 
colored mineral in minute acicular needles, which are apparently 
rhombic. It was associated with gold, iron and copene pyrites. 
B.B. it gave the reactions of sulphur, bismuth and co r, an 
once I observed a faint odor of selenium. Afterwards I found 
that the chloritic slate of the same vein, in which the copper py- 
rites occurs, contains also a considerable quantity of almost mic- 
opic specks and stripes of the same color. On extracting 
some of the slate by aqua regia, the opi contained, hesides 
iron and copper (probably from the cop yrites), a considerable 
quantity of bismuth. Neither slime por send could be found. 
It is impossible to get a sufficient quantity of this mineral for 
analysis, or of sufficient purity to ascertain whether the copper, 
which I found, belongs to the mineral itself, or is owing to an 
admixture of copper pyrites—or, in other words, whether the 
mineral is “ Cupreous Bismuth,” or Bismuthine. Iam in favor 
of the latter opinion. 
7. Aciculite.. 
A mineral between lead and steel-gray in color occurs in small 
masses imbedded in quartz and associated with copper pyrites and 
sulphate of baryta. Though it is ‘not found in long acicular 
needles, like the needle ore from. Beresofsk in Siberia, a qualita- 
tive analysis showed that it conan the same constituents, viz: 
bismuth, lead, copper and sulphu 
B.B. it fuses readily, giving of ‘sulpburons acid and covering — 
the charcoal with yellow incrustations; with carbonate of soda, 
after ~ and bismuth have been volatilized, a globule of 
Copper rei 
I therefore ' bolowe it to be “ | Aciculite.” 
8. Barnhardtite, a new mineral. 
a. In compact masses; nocleavage could be observed. H.= 
3:5; Sp. grav. (at 25° Cels.) = 4-521; lustre metallic, but some- 
what dull; color bronze-yellow ; streaks grayish black and slight- 
ly shining; opaque ; fracture conchoidal, uneven ; brittle; tar- 
nishes very soon, more readily in bata rh of moisture , assuming 
a peculiar brownish, eevee 
atimoc also 
ge Peieaty 
B.B. give pare ea pale -_ tes easily to an iron- 
black magnetic slobule ; with borax it gives the reactions of cop- 
nd iron ; ee: carbonate of soda and borax metallic copper. 
aboratory by Mr. Wm. J. Taylor (I), Mr. 
t was analyzed in. oratory by 
rea Peter Witeviee (i) at wi myself (1), ” a copper determination 
was made by Mr, Be Saale Ty ).* 
sey Se a hematite was mixed with the mineral ; 
“Seon Sm Va X08 Se 56.-Jek. 1855. 3 
~ 
