A. A. Hayes—Red Oxide of Zine of New Jersey. 197 
fragments of ore of one-third of an inch cube in cambrie cellu- 
lose as above stated, and using as a solvent the ammonia chloride 
and hydrate solution in the jars, the ore dissolves freely, while 
the surface of the solution, and later the outer folds of the rolls 
ome covered with the manganic deutoxide, formed from 
om protoxide as it is withdrawn from the protoxide solution 
Manganese existing in the ore; but it also removes both zine 
ac Manganous oxides from the mineral. As oxygen cannot 
penetrate the folds through a manganous solution, after the 
action has ceased we have left on the inner fold the intrusive 
muneral, brilliant, satin-like in luster, and in the most perfect 
State it has presented. It has, however, been partially decom- 
Posed, and is a skeleton or silhouette of the original, greatly 
expanded, excepting just where it is engaged in undissolved 
Portions of the fragments. 
us obtained, its general hue is brown, by reflected light, 
*y We see it by the microscope in the mineral ; but its micaceous 
films transmit white and yellowish rays, excepting when engag- 
ing scales of specular iron; then reddish-brown to orange-red 
Tays are transmitted, and the reflections become lustrous in a 
high de. ree, * 
The production of color by this intrusive mineral, which 
may be considered as a silicate of zine, calcium and ferric deut- 
oxide, seems to depend on its mica-like structure and com- 
Foo composition, including the specular iron scales. We 
Pile Seen that the ore loses its red color when a ray of light is 
mnsmitted, or only the brown color of these scales comes in 
“ew, and where partial absorption succeeds red color results. 
- 
The experiments demonstrating its constant presence in the 
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ss in close textures rests. Even when we use nearly pure cel- 
wose Paper-filters of finest texture, and many folds, the mineral 
ae and we reach that state of division, where mor e 
f d colors, or the mystic boundary separating solution proper 
tom pension. ‘The apparent staining of the calcite by the 
ed to is here explained, and the necessity for the exist- 
nly a small part of this was color-producing material. 
* It is not, id peacock hues of the an- 
ia perhaps, generally known that the splendid pe — 
light ‘6 coal of ienaytradiic in the upper layers, are due to the decomposition 
* by the films of calcite, formed from calcium crenate as in Newtonian rings. 
