The term Greenstone also is of very loose application, and includes rocks that exhibit a wide range of characters; the predominant colour being some shade of green, the structure more or less crystalline, and the chief ingredients supposed to be hornblende and felspar, but the components, if they could be accurately determined, probably more numerous and varied, than systematic lists imply.) PERCY ISLANDS, about one hundred and forty miles north of Cape Capricorn.
Compact felspar of a flesh-red hue, enclosing a few small crystals of reddish felspar and of quartz.

This specimen is marked "general character of the rocks at Percy Island," and very much resembles the compact felspar of the Pentland Hills near Edinburgh, and of Saxony.

Coarse porphyritic conglomerate, of a reddish hue.Serpentine.A trap-like compound, with somewhat the aspect of serpentine, but yielding with difficulty to the knife.

This specimen has, at first sight, the appearance of a conglomerate, made up of portions of different hues, purplish, brown, and green; but the coloured parts are not otherwise distinguishable in the fracture: It very strongly resembles a rock which occurs in the trap-formation, near Lyd-Hole, at Pont-y-Pool, in Shropshire.

Slaty clay, with particles of mica, like that which frequently occurs immediately beneath beds of coal.
REPULSE ISLAND, in Repulse Bay, about one hundred and twenty miles north-west of the Percy Islands.