Compact felspar, of a flesh-red colour; very nearly resembling that of the Percy Islands, above-mentioned.
GOOD'S ISLAND, one of the Prince of Wales group, about latitude 10 degrees, thirty-four miles north-west of Cape York.

The specimens, in Mr.
Brown's collection from this place, consist of coarse-slaty porphyritic conglomerate, with a base of greenish-grey compact felspar, containing crystals of reddish felspar and quartz.

This rock has some resemblance to that of Clack Island above-mentioned.
SWEER'S ISLAND, south of Wellesley's group, at the bottom of the Gulf of Carpentaria.

A stalactitic concretion of quartzose sand, and fine gravel, cemented by reddish carbonate of lime; apparently of the same nature with the stem-like concretions of King George's Sound: (See hereafter.) In this specimen the tubular cavity of the stalactite is still open.
The shore, in various parts of this island, was found to consist of red ferruginous matter (Bog-iron-ore ?) sometimes unmixed, but not unfrequently mingled with a sandy calcareous stone; and in some places rounded portions of the ferruginous matter were enveloped in a calcareous cement.
BENTINCK ISLAND, near Sweer's Island.

A granular compound, like sandstone recomposed from the debris of granite.