: Calamine in Missouri: ST% 
% 
dance. Ithas hitherto been rejected by the miners at that 
spot, as entirely useless. ; 
“¢ This ore occurs crystalized in reniform mammillary, ox 
stalactical concretions, and is sometimes corroded, cellular, 
in crusts, &c. ee 
The first, namely, the crystalized variety, we found par- 
ticularly in the mines of Mr. Valles, who was kind enough to 
give us every facility in making a proper selection of the ores 
which his mines contained. These crystals form large 
masses of small crystals heaped together and generally 
colored by argillaceous oxide of iron (yellow ochre.)—Its 
form is an obtuse rhomboid, having mostly the edges emar- 
inated and the solid angles trancated. These emargina- 
tions are often curvilinear; giving a globular appearance to 
the crystals. As the rhomboid is the primitive form, and 
having a laminar structure in three directions, that is, par- 
allel to the six sides of the rhomboid, the faces, when the 
crystals are not contaminated by the oxide of iron, being in 
that case of a grayish white, have a fine pearly appearance, 
while the secondary faces are dull and somewhat striated 
parallel to its sides, forming a pretty mineral. — 
The other, the concreted variety, is more abundant ; it 
occurs generally in cellular or corroded masses, which ap- 
pearance has perhaps given it the name of dry-bone. These - 
concretions have often an imperfect fibrous structure ; some- 
times it is compact—its fracture somewhat splintery, uneven, 
and is either dull or glistening, of an adamantin lustre, trans- 
lucent, and sometimes opaque—its color is sometimes gray, 
sometimes yellow approaching to brown, owing to the ox- 
ide of iron 
only ones 
in the United States where this mineral occurs In pris es 
. is- 
ed ati’ : s Sea 
sissippi, makes this ore of the highest importance. 
e* li i tionable authority, 
that the country to the southwest of lake Superior kas sim 
und in an oxide rich in native copper. ow these 
two. substances, namely, the 
every one knows) . the ingredients which 
‘osition of Brass, a metal so muc e 
ae constituents of which it at present imported iF 
VOk, XII—NO- 2. Ag 
