338 TRAVELS IN 
their similarity to those remarkable stones already noticed un- 
der the names of the Pearl and the Diamond, but ten times 
their size, as a point of distinction in the chart, I gave the 
name of the Namaaqua Pearls. 
The loose fragments of stone on the sides of the Khamies 
berg, Avhether detached pieces of granite, or greasy quartz, or 
flinty pebbles, had almost invariably that side which lay next 
the ground, tinged of a blue or green color, but mostly of the 
latter. The veins that ran through the mountainous masses of 
granite were generally filled with semi-transparent quartz, 
among which were both metallic crystallizations and arbori- 
zations. In several places were curious flat rocks, colored 
red and yellow,, which might be taken up in such large flags, 
and were so easily cut with a knife, that thoy had obtained 
the name of plank-stone. In the veins of this stone were also 
metallic plates of a pyramidal form, and a greenish color. All 
these appearances indicated the existence of abundance of 
copper in the Khamies berg. In fact, this is the commence- 
ment of what are called the Copper mountains^ from the 
quantity of Malachite that is said to be strewed over their 
surface. In these mountains is also found, in large blocks, 
that species of stone to which mineralogists in Europe have 
given the name of Prehnite. This stone possesses most of the 
characters of Zeolite ; but having some others from which it dif- 
fers, it was considered as a new species. Some specimens are 
extremely beautiful; they are generally of an apple green 
ground marked with white, pale yellow, or brown stripes, or 
spots. The only use or ornament to which the Dutch apply 
it, is that to which it is least suited, namely, the converting it 
