90 A V G Y A G E T O'
1776- Canary Iflands, the Cape of Good Hope, and at this place
December.^ browmfii brittle ftone forms here fome confiderable
rocks; and one which is blacker, and found in detached
pieces, inclofes bits of coarfe quartz. A red, a dull
yellow, and a purpliih fand-ftone, are alfo found in fmall
pieces; and pretty large lumps o f femi-tranfparent quartz,
difpofed irregularly in polyedral pyramidal cryftals of long;
ihining fibres. Some fmall pieces of the common fort are
met with in the brooks, made round by attrition but none
hard enough to refill a file. Nor were any of the other
{tones acted on by aqua fortis, or attracted by the magnet.
Nothing, that had the leaft appearance of an ore or me--
tal, was feen.”'
C HA P .