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stones. The present, like most British specimens, are 
more porous than the Oriental ones, but in other respects 
are the same, viz. Quartz mixed with Oxide of Iron and 
Argill. It is very handsome, and takes a good polish. 
Stones of the same sorts are found on many of our coasts, 
but are still more porous, and veined with opaque Quartz, 
&c. The lower specimen is from Devonshire, sent by my 
friend G. Montague, Esq. I suspect they fall from near 
the Serpentine Rocks, and that the red Serpentine may be 
traced from the softer state to the indurated or harder Ser- 
pentine holding Jasper, and may thus have been occasionally 
confounded with it. Serpentine may generally be scraped 
with a knife; Jasper, I should think, never: and it is perhaps 
worthy of observation, that different states of red Serpentine 
resemble Brick ; and some curious persons have picked up 
these in various states from that resembling soft Brick to 
Jasper, considering them as Brick passing from the more 
soft beginning of petrifaction to the more hard and stony. 
