170 GEOLOGICAL RECONNOISSANCE 
ORES OF IRON. 
No. 25. Yellow ochre, from the St. Francis side of Crowley’s ridge, near 
David Schultze’s, between township 18 and 19, range 8, Greene county. 
A loosely aggregated, amorphous, homogeneous rock, of gold-yellow 
color; very friable; feels gritty between the fingers; becomes brick-red on 
ignition: 
Composition dried at 220 deg. F: 
Fin€: sands sictaein stains swe as 71.081 
Sesquioxide of iron. +++. ++ eeeeereeceeees 23.640 
Alumina + +ssseceeeuvee . see eesne trace 
Water -+-ceeeee iS MIS a Se Bea: ore eran » 5.094 
99.815 
The air-dried substance lost 1.15 per cent. of moisture at 220 deg. F. 
This ochre forms only asmall deposit in the quarternary rocks of Greene 
county, and is evidently nothing but a fine sand impregnated with hydrated 
sesquioxide of iron, which is the coloring principle. The amount of iron 
(15.55 per cent.) is too small to constitute this ochre an iron ore, even if 
the deposit should prove to be very extensive; but it may be profitably 
used as a paint, both in its natural state and calcined, since it is very soft 
and uniform throughout, and hardly needs any washing in order to remove 
the coarser particles. 
No. 26. Limonite, from Old Jackson, Lawrence county. 
The ore consists of contorted, more or less concentric layers of brown- 
ish-red, steel-gray, and brownish-black color; it contains amygdaloidal 
cavities filled either with stalactitic, glossy red hematite, or with yellow 
hydrated peroxide of iron. 
Dissolves in hydrochloric acid with evolution of chlorine. 
Composition of air-dried ore: 
Clay, sand, ANG: SUCA se 4s ene Woo eeane a's Save Wee rarer eor es 15.069 
Sesquioxide OL. TG Tansee eo oe Shes a Sake GS 58.278 
Sesquioxide of manganese. -+-+ee secre ee eeereees 13.843 
Alumina «+eeeesvereuees eee ewan sec oeeeeeveeesee§ trace 
* Oxide of cobalt --.+-++- a rag dea lac ono ech acer eae .. trace 
Carbonate of magnesia -+-+++eeeereaes toate eee ene 0.664 
