General characters as above, but on some parts, there is seen a
whitish, or yellowish, or sometimes darkish metallic substance; it
is in thin plates, like the leaf metals, and sometimes reticulated,
and graphic in its disposition; it is soft and easily cut with the
knife. In the specimens examined, it was so much blended with the
other ore, and so trifling in quantity, that it was not possible to
separate it mechanically, so as to examine it separately.