Amianthiform Arseniate of Copper

The upper specimen is nearly of a straw colour, and diverges 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 Rore of Cornwall, but may be readily known from it by being so much less heavy than that ore. This appearance occasioned the common denomination of Wood Copper, before Count Bournon’s paper above alluded to was published.