No. 21. A. "Copper ore." A fair average specimen was prepared for
examination from the several lumps of ore and marked a.

a. It was submitted to analysis, and found to contain carbonates of lime
and magnesia; silica, alumina, and oxides of iron; and of--
Copper (metallic) . . . .5.72 per cent.
b. A portion of the copper mineral, from which the rock or vein-stuff had
been detached as far as practicable, was found to consist of impure
hydrated silicate of copper (bluish-green chrysocolla) and carbonate of
copper. It was assayed and found to contain of--
Copper (metallic) . . . .23.14 per cent.

No. 22. "B." A lump of soft, ochrey red-brown ironstone, coated with a thin
layer of greyish white substance. A fair average sample, inclusive of this
external layer, was prepared for examination, and was found to consist of-
Peroxide of iron (per cent. ) . . .81.14
Water . . . . . . . . . . . . . . 11.50
Silica. . . . . . . . . . . . . . . 3.07
Sulphuric acid, lime, magnesia, alumina 4.29
_____
100.00

The peroxide of iron contains 56.8 per cent. of metallic iron. The
greyish white substance was found to consist of silica, alumina, sulphate
of lime, and a little oxide of iron and magnesia.

No. 23. "C." Lump of red ironstone associated with sand and earthy
substances, containing
Peroxide of iron (per cent.). . . 68.09