NATURAL SCIENCES OP PHILADELPHIA. 
175 
Heteromorphite. 
'•h has never been mentioned as occurring on this conti- 
1 a specimen labelled " Antimonial Silver ? from Chonta, 
^ pyrites, and crystals of quartz colored nearly black. 
Vaux, Esq., for the specimen. 
Uy in the form resembling cobwebs ; some cavities 
pillary crystals about one-sixteenth of an inch in 
tie irised, lustre a dull metallic, B. B. sulphur, 
whiC\ 
was at 
SmaL 
x a tTiatra.83 
7ery dark ; B, 
Vauquelinite. 
1 the United States is very rare, having, I be- 
d near Sing-Sing, N. Y., by Dr. Torrey. I 
from Pequa Lead Mine, Lancaster Co., Pa., 
-minations, (distinguishable with a good 
^gations, forming incrustations on quartz 
"considerable adamantine lustre ; their 
nle green ; some of the detached crys- 
', \vr; 's probably owing to their partial 
• on the first application of heat 
^orus in oxydising flame a trans- 
:• U' . , ., ^e, red bead from presence of 
■ ' sparentgreenbead when hot, 
atch glass, a drop of water 
iparent. 
> galena. 
It will bt "Schuylkill near Fair- 
mount, of a , ^llmenite. I have a 
line crystal, a i inch in thickness, 
which was giv d the locality. 
Prof. Leidy ga\ 
a coal mine in Sci ■ 
now suppose to be i 
material for a quantit. 
eral, with a pearly lut 
thin layer, not exceediUi, igt i 
B. B. acts as pyrophyL 
ation is not so great as wii 
Implanted in this pyroph^ 
crystals ; they are quite smai 
inch in length, while the main 
one-twentieth of an inch. The 
one-tenth of an inch are perfectly 
minute hexagonal prisms with dist 
quartz, from 
xamination I 
cient of the 
waxy min- 
curs in a 
me!? wbite. ^.m: exfoli- 
mineral. 
uteresting quartz 
v;cher five-tenths of an 
^ diameters of one-tenth to 
-a-e hexagonal prisms, which for 
.icnt, and terminate at each end in 
. terminations ; the larger crystal has over 
fifty terminations at its upper, and over thirty at its lower end: the smaller 
crystal has fewer terminations (not exceeding twenty), but these terminating 
prisms are longer and more distinct. The terminating prisms show a marked 
tendency to divergence or to radiate from the central prism. 
The terminating planes of the many prisms, which I was able to distinguish 
with a good lens, are R and —1 ; the plane (—1) is however quite minute, llj 
reason for particularly describing these crystals (which can be done very im- 
perfectly without drawings) is, that I think there is a tendency to the form de- 
1858.] 
