66 Capt. Bonnycustle on some of the 
In a!l probability there is a great deposit of magnetic iron 
hear Kingston, as well as of other ores of iron; large masses 
are occasionally seen, and I have met with very pure ores in 
tumps as large as a man’s head. 
I propose to close these observations upon a few of the 
rocks and minerals of Upper Canada, by adding a mineralo- 
gical annalysis of the Marmora ores of iron, together, with that 
of a Kingston mineral which, I believe, has hitherto been con» 
sidered erroneously to be tremolites 
I Magnetic oxide of Iron, Marmora, Upper Canada, 
‘This mineral is composed of large and small crystals in thé 
inass, (sometimes though not frequently exhibiting the form 
of tie octahedrén,) generally strongly bevelled on all their 
‘edges. Ceélour externally iron black; on a fresh fracture, 
fron grey inspots. Fracture, uneven with cavities. Lustre, 
weakly metallic. Powder, under the hammer black ; under 
the file also black; streak, metallic. Alone on charcoal very 
difficult to fase. With borax, on platina wire, it first becomes 
ted, then bottle green, and when ceol it forms a transparent 
and colotrless glass. With salt of phosphorus the same is 
observed: It strongly attracts the insulated needle. 
This is the granular magnetic ore and exists in immense 
quantities on the Crow Lake, forming mountain masses. It 
is very valuable, and although it contains much sulphur, from 
the quantity of carkuret of iron and argillacious ores found 
near it, its fasion is accomplished without great expenses. 
W°.i1,—Red oxide of Tron and fibrous hornblende, 
BMarmora. 
This thass‘has a laminar structure in the direction of the 
fongitudinal fracture, but is very compact. The hornblende 
‘covers both faces of the flattish surfacés, and appears some- 
times penetrating the mass. Tt has the peculiar odour of 
hornbleide, a fibrous structure, resinous lustre and bitumi* 
iofts Appearatice ; the fibrous structure when filed across its 
length 
