OF ARKANSAS. 149 
75.474 per eent. of carbonate of zinc, are equal to 48.95 per cent. of 
oxide of zinc, or to 39.30 per cent. of metallic zinc. 
No. 2. Same as No. 1, impure. 
Composition, dried at 230 deg. F: 
Clay, and silica ++ +e+eeseeeee teeeeeeeeeees 31,069 
Carbonate of Zinc. +. sees cree ce ee ween eens 51.111 
“ tO Viriiey 4 bask a eas oe Lone tests 8.114 
‘ “ magnesia-+.+.-.. i 4.417 
Peroxide of iron, with traces of alumina and 
MANGANESE+ see reer es ee sree rnerenveee 4.800 
99.191 
The air-dried mineral lost 1.29 per cent. of moisture at 230 deg. F. 
51.111 per cent. of carbonate of zine are equal to 33.149 per cent. of 
oxide of zinc, or to 26.60 per cent. of metallic zinc. 
B.— Ore from the Bath mine. 
The prevailing ore at this locality is a massive, brownish-yellow, cellular 
smithsonite; the cavities are clad out with botryoidal incrustations of 
grayish-white smithsonite, and occasional buff-colored crystals of the same 
mineral. The surface of the ore is covered with a thin crust of yellowish- 
red clay. Several pieces of the ore were crushed, well mixed, and from 
the mixture two samples taken for analysis, (No. 3 and No. 4). 
At this mine occurs also the light-colored, soft variety of carbonate of 
zinc, partly amorphous, partly sub-crystalline, pieces of about a cubic 
inch of which are cemented together by the dark brownish-gray or 
brownish-yellow cellular smithsonite above described; the dark-gray cel- 
lular masses often consist of concentric layers, the outer layers being gen- 
erally of a much lighter color,and contain occasionally crystals of brown 
blende. 
The dolomite containing the ore at this locality, abounds with small 
veins of pearlspar, and with amygdaloidal cavities, sometimes an inch 
wide and two and a half inches long, which are filled with crystals of 
pearlspar and blende. 
No. 3. Brownish-yellow, cellular, smithsonite. 
Composition, dried at 250 deg. F: 
Clay, and silicas++++++seeseeees seen seas 8.831 
Carbonate of zinc: +++++++++ feeesseeteneeees 86490 
6c So Jie cee seen reese . eee ee 0.742 
