95 



TAB. XLVL 



The upper specimen is nearly of a straw colour, and di- 

 verges in a stellated manner from a common centre, with a 

 good deal of the appearance of that kind of rotten wood 

 called Touchwood. I have seen specimens of different 

 shades of green, which somewhat resemble the Byssus-like 

 carbonate of copper, see the surface of the lower figure, 

 where there are also the various colours from straw to dark 

 brown, some of which appear of the colour of darkish 

 brown rotten wood, a little resembling the wood Tin Ore 

 of Cornwall, but may be readily known from it by being 

 so much less heavy than that ore. This appearance occa- 

 sioned the common denomination of Wood Copper, before 

 Count Bournon's paper above alluded to was published*, 



