ee EE a 5 ee en ae 
ate a fey > SS 
= ~~ = = i Ed ee et 
a, heel : : 3 
Miscellaneous Localities of Minerals. 249 
readily admit of glenvage parallel to the lateral planes of a 
rhombic prism, of 125° and 55°. There is also a cleavage 
apparently Pe tpanslcttit to the axis of the prism ; but it is 
attended with some difficulty, and the planes produced by 
it are not very brilliant or perfect. Its colour is hair-brown, 
of various shades. It possesses a shining, pearly, pseudo- 
metallic lustre,. is translucent, and ‘scratches fluate of 
lime, and glass; the latter, however, with difficulty. Be- 
fore the blow-pipe it is infusible. 
a Pseudomorphous Quarte is found at the Southamp- 
n lead-mine, in crystals having the form of hexaedral 
prisms, with triedral terminations. They probably received 
rae form from carb. lime, which has since  ddouyad: and le 
them hollow. They occupy cavities in quartz, and are 
Eroupee 29% together, lying in every direction. They are quite 
mall : e of them being more than half an inch in length, 
or one pe of an inch in diameter. ‘Their colour is uni- 
formly a brownish yellow—when viewed with a good micro- 
scope, their outer surface is aaa: to be covered with 
exceedingly minute six-sided pyram 
3. Carbonate of Lead is foutid SF the aT eta 
lead-mine, crystallized in right rhombic prisms of 117° a 
63°—its primary form. The following Mei of this oe 
ral occur at the same place. Green Carb. of Lead. The ~ 
colour is uniformly diffused through the mass, or crystal, and 
is occasioned by the infiltration of green carb. of copper. 
Earthy Carb, of Lead. Its colour is reddish brown. It oc- 
curs massive, and disseminated. [ts fracture is uneven, and 
presents a somewhat resinous lustre. It is usually opaque. 
In dilute nitric acid it effervesces. Before the blow-pipe, 
it splits with decrepitation, and is immediately reduced te 
the metallic state. 
t, March 22, 1825- 
4. By Dr. E. Emmons. 
Carb. Manganese, Cummington, (Mass.) 
jour red, varying from flesh colour to rose red. Exter- 
sal gray, grayish | ope and black. The purest specimens 
vocab teuhdian te of lime. The recent frac- 
ian soon Boi to a Tha colour, on being exposed to mois- 
ture. 
Vor. IX.— No. 2. 39 
