OF ARKANSAS. 151 
No. 5. Brownish-white, cellular smithsonite. 
Composition, dried at 250 deg. F: 
Siligawareauaad< ic isst a wae Bererle hes garb 0.501 
Oxide of zinc s+. eeceeseaee 8) 98a) Goh 'eue at er 8's ge ha fo 61.753 
Peroxide of iron.+..+... bee eeeeees err 0.552 
Alumina ».+.+. mar erat gree areca een has Selhlea we 0.097 
Lime «esse eens asa Gielen area) @ierager ee tewe ede Warder : 1.338 
Magnesia. -s eee cee ee cccc cece sence aay eae trace. 
Carbonic acid, water, and loss--...-..+++4- 35.759 
100.000 
The air-dried ore lost 0.14 per cent. of moisture at 250 deg. F. 
61.753 per cent. of oxide of zinc are equal to 49.59 per cent of metallic 
zinc. 
No. 6. Same as No. 5; different specimen. 
Composition of air-dried ore: 
Carbonic acid and water «-+-+eseeeeeeeeees 85.911 
Insoluble residue (silica, iron, lime, etc.,).-+- 6.839 
Oxide: Of Zins soos 0c s se ewe ea bee aol ees apes 57.250 
100.000 
No. 7. Same as No. 5; different specimen. 
Composition of air-dried ore: 
Carbonic acid and water + «+++ esse er eeees 35.267 
Insoluble residue (silica, iron, lime, etc,,)- +++ 8.298 
Oxide of Zinc. ++ -s cece ence ener ee ee ee aeee 56.445 
100.000 
The mean of analyses Nos. 6 and 7, shows 56.847 per cent. of oxide 
of zinc, combined with carbonic acid or water, which is equal to 45.65 per 
cent. of metallic zinc. In both cases, the residue from the treatment with 
ammonia, was found to contain zinc, whence the presence of a small 
quantity of silicate of zinc may be inferred. 
B.—ORES OF ZINC FROM MARION COUNTY. 
In this county, the only locality from which specimens of ores of zinc 
were obtained, is known as “ Wood’s mine,” situated, section 13, township 
19 north, range 17 west, on the west branch of George creek. The ore 
occurs here, as in Lawrence county, in pockets or veins in dolomite (the 
analysis of which is given in No. 34,) and is in most cases found imbedded 
