Hawokrts. | Lead and Zine. . Al 
CALAMINE.— Hydrous zine silicate, Zn,SiO,, HO. Zinc= 
54.2 per cent. Calamine is a secondary product produced 
by zinc sulphide being weathered into zinc sulphate, and 
thereby rendered soluble and carried here and there by the 
ground water. In some way it is brought into contact with 
silicic acid under conditions favorable for a reaction to take 
place producing the insoluble zinc silicate. It may be de- 
posited immediately at the point where the zinc exposed was 
first rendered soluble, or the zinc may have been carried to a 
distance through the ground and the calamine deposited 
where conditions were most favorable for its precipitation. 
There are good reasons for believing that in the vicinity of 
Granby the formation of calamine is now in progress, as 
fresh, bright crystals are found adhering to the outer surface 
of fresh zinc blende, calcite, flint rock, and in fact any and 
all kinds of material which seem to have gotten in its way. 
For some reason calamine has been produced in only exceed- 
ingly limited quantities in Kansas. Granby is the great 
place in the entire southwest area for its production, although 
marketable quantities of it are found here and there in differ- 
ent places in Missouri. 
These three ores—blende, smithsonite, and calamine—are 
the only ones found in Kansas, Missouri and Arkansas which 
contribute to the production of metallic zinc. In New Jersey 
and a few other places zincite, or red oxide of zinc, occurs in 
sufficient abundance to have a fair commercial value. 
Zinc is known to the mineralogist in many additional 
forms, the number of distinct minerals carrying it being 
great. But these latter are of no commercial importance 
whatever as a source of zinc, and therefore are serviceable 
only to the mineralogist. 
