58 CHRYSOPRASE. 
On several of the British shores carnelians-are found 
with other pebbles : but the most beautiful and valuable 
kinds are imported from the East Indies. These are 
sometimes so large as to measure nearly three inches 
in diameter. The kinds principally in request are those 
of pure white, and bright red colour; and jewellers 
have the art of changing the colour of the yellow 
varieties to red, by heat. 
No stone is so much in request for seals as carnelian. 
It is likewise cut into beads for necklaces, and stones 
for ear-rings ; into crosses, bracelets, and other trinkets, 
which, in India, form a considerable branch of traffic. 
The amount of the sale value of different kinds of car- 
nelian goods vended by the East India Company in 
1807, was 1I,187/. : but, in other years, it has not 
usually been so much as half that sum. 
Formerly carnelians were exported from Japan to 
Holland ; and thence were carried to Oberstein, in 
France, to be exchanged for the agates of that country, 
which were exported to China. 
The carnelian was much esteemed by the ancients ; 
and many fine engraved carnelians are preserved in dif- 
ferent collections. 
94. CHRYSOPRASE, an extremely hard kind of stone, 
of clear and delicate apple-green colour, is considered to be a 
kind of calcedony. 
This beautiful mineral has hitherto been found 
only in the vicinity of Kosemitz, and in a few 
other parts of Lower Silesia. It is susceptible of 
a high polish, and is much prized by jewellers when 
its colour is deep and pure. Its colour, however, 
is so fugitive, that, if kept in a warm and dry situa- 
tion, it loses the greatest part of it ; and if exposed to 
moisture it becomes much altered. Lapidaries assert, 
that great care ought to be taken in the polishing 
of it ; pretending that if, from want of sufficient 
moisture, or by the too rapid motion of the wheel, 
it be over-heated, it will become whitish or turbid. 
