512 GEOLOGY OF OHIO. 
1 2. 3 
Silica’ 5... csccacuogastaswece soteoceenscroseesasosese soem sada tbbeace 52.92 53.71 49.37 
AN UGATILTES EHAVG| CS.AIGKE GE IHROTN Goo0d625000660000 000000 40000000000000 22.24 22.94 22.49 
BBD is RRR pric GaoccnncSaccaconp on aL DE EEnaode nocBL cosas auodasosdosonas 21.51 20.67 26.14 
ITY ESS YEYETIEN” $6506060090000000600000 NOIOHB0006008000 aBoboHbObebUdeDDA6 add06d 1.93 2.09 1.95 
ORGS Chi TNETMETTEES 0000000050000000000006000000000000090000800000 1,66 undet. | not det. 
Sullpintimseesecseses Vesela dlenenisde cosiecee ede celsseweraens sus lesueocoeseaces 0.16 0.19 0.29 
BH OSPHOFUS sccccens -wacesssseetiocancece tose eee eeaeet weaaitenets none. none. none. 
These slags are from Hamden furnace, and accompanied the No. 1, 
No. 2 and silver gray iron, respectively. 
The silvery irons made in this district owe their peculiar char- 
acter to high percentages of silicon, which gives the light color and 
greasy lustre, sometimes so strongly marked; oceasionally such pig- 
irons reach unusual percentages in silicon, one from Star furnace at 
Jackson, showing 6.62 per cent. of that element. The silica or silvery 
pig commands a ready sale for foundry purposes, serving as a softener 
in mixtures; for making wrought-iron it is, however, nearly useless, as 
it causes great destruction of fix or ore lining in the puddling fur- 
nace. | 
A peculiar kind of white iron in large crystals has been made from 
time to time at various points in the Hocking Valley and Hanging 
Rock districts. It was sent to the University laboratory as possibly 
spiegel iron. Analysis showed that it owed its peculiar properties to 
excessive amounts of phosphorus. 
Of this character was the iron made at Mt. Vernon furnace from 
what was locally known as the “ Hallelujah ore.” ‘The iron was in 
large crystals of a tin-white color; it was hard, but n-t so hard as or- 
dinary white iron; it was extremely brittle, being easily pounded to 
powder, and could be broken from the pig in flakes with a hand-ham- 
mer. This iron showed 4.30 per cent. phosphorus ; it was low in silica 
and carbon, being almost a phosphide of iron! 
The ore (Hallelujah ore), from which it was made, showed on <na- 
lysis 2.14 per cent. of phosphorus. } 
As stated before in this report, a quite similar iron was made frum 
the ore deposit near Moxahala furnace. 
