By what signes Mines are discovered.
Now concerning the other signes of the internall earth, as also the colours of Mineralls, we shall briefly discourse of them thus.
As oft as Miners fall upon a fat earth, which doth signifie a vein of a pure, and new metall, that is a very good signe assuring that, that Metall, of which it is a vein, is not far off.
So also if the earth that is digged have no Metall in it, but be fat, of a white colour, or black, or like clay or green, or blue, &c. then that also is a good signe of some good Metall that is hid under it. Therefore you must continue digging, and not give over.
Miners in the first place have respect to the excellent, beautiful, and chiefest colours, as are green earth, or Chrysocoll, Verdegrease, Azure, Cinnabar, Sandaracha, Auripigmentum, Litharge of Gold, and Silver, &c. every one of these almost doe for the most part signifie a peculiar Metall, or Minerall.
So Verdegrease, Chrysocolla, green earth, for most part signifie Copper.
So Azure, or white Arsenick, or Litharge of Silver signifie the Metall of Copper.
So Cinnabar, and Sandaracha do sometimes signifie Gold, sometimes Silver, and sometimes a mixture of both.
So Auripigmentum, red Sulphur, and Litharge of Gold, for the most part signifie Gold.