184 GEOLOGICAL RECONNOISSANCE 
amorphous, yellow, soft variety of smithsonite; powder of dirty cream- 
color. 
Occurs in fissures in dolomite. 
Composition of air-dried ore: 
LCR eek eRe ie Gas BEG ee a PI Ty Ma 2.367 
Sesquioxide of irons +. +e sere cee cece ee eeenerene 2.750 
ORIdG: OF ZInGisis see Swe as a a Gee ee A Gee 55.238 
Sulphuret of zinc: +++. cess eee cece eee eee eens 0.328 
Dah Gi ise 6 66s ote RRL We SOT Wa ai BS a Rte eee eee 2.158 
Magnesia ++ eee cece eee reer cece ee en teen reece 1.065 
Carbonic acid and water. +--+ esse cece erences 34.738 
98.644 
55.238 oxide of zinc contain 44.334 metallic zinc. A very:good ore for 
smelting, intermediate between No. 4 and No. 8, of the Bath mine. 
No. 55. ssacsive smithsonite, from Mr. Smith’s land, township 17, 
range 2 west, section 10, Lawrence county. 
A massive, soft, earthy rock, of white, reddish-white, and pale-yellow 
color, containing amygdaloidal cavities, which are, in part, filled with 
inerustations of botryoidal smithsonite; the surface of the latter fre- 
quently covered with a thin layer of peroxide of iron. The rock contains 
crystals of galena imbedded. 
Composition of the earthy, air-dried ore: 
White sand, and clay (?) +++: ++ sete ee ee eee e eee 26.454 
Sesquioxide of iron, and alumina. -+++-++.-++.ssee. 2.193 
Oxidé-Of ZiiG ve cme iaws teow bo STNG FHSS Re 27.600 
Sulphuret Of lead. @scoas eas eaieew Ox Se eee ee RO eae 0.793 
Dilii@nsd $49 ie 35 8 oes eG as Game ee -..  ~ ~=8,048 
Magnesia 58 Ma iahie Gy Gocdhoe Uh “pises oh ww igh Siew dere el eS @ ale, fh elan ator e Bice 3.260 
Carbonic acid, water, and loss «++ +e esse eee eens 31.652 
100.000 
27.600 parts of oxide of zinc contains 22.15 parts of metallic zinc. Not 
a rich ore, but equal to the Silesian ore No. 11, of the table on page 156. 
No. 56. Smithsonite, from the Koch mine. 
For the subjoined analysis, pieces of the pure, botryoidal smithsonite 
were taken, which occur as an incrustation on the compact ore. 
Concentric incrustation, internal structure semi-fibrous; color yellowish- 
gray, the outermost layer dirty reddish-gray; hardness between 4 and 5: 
fracture conchoidal; lustre vitreous; subtranslucent; brittle. 
