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GRANITE. 
Corsica produces a very singular and beautiful 
kind of granite which is full of spots formed of con- 
centric zones composed of quartz, mixed with layers 
of felt-spar, distributed in rays, which converge to- 
wards the centre of the spot. This fine granite has 
not been as yet discovered in large masses, but is 
generally met with in little loose blocks. 
In Siberia, among the Uralian mountains, we 
meet with a rock composed of the same elementary 
substances as the common granite; but instead of the 
confused crystallization which marks that stone, we 
find the several materials which contribute to the for- 
mation of this kind, disposed in a very different man- 
ner. At the bottom of the rock is the felt-spar, of a 
whitish colour, and of a lamellated and shining tex- 
ture ; the mica is distributed in little elongated 
nests ; and the quartz is disposed in such a manner, 
that when the stone is cut in a certain direction, its 
surface bears some resemblance to written charac- 
ters ; from whence it has obtained the name of 
graphic granite. 
The other countries which produce this granite are 
Scotland and the island of Corsica. The first has 
been described by Doctor Hutton ; the second by a 
French mineralogist. M. Patrin mentions a large 
specimen preserved in the Museum d’ Histoire Na- 
turelle , where it makes part of the collection of rocks 
from Corsica, which were brought to Paris by Bo- 
naparte, and arranged by Barral. 
