That al the vice goth aweie[1325]
Of rust, of stink and of hardnesse:
And whan thei ben of such clennesse,
This Mineral, so as I finde,
Transformeth al the ferste kynde 2560
And makth hem able to conceive
Thurgh his vertu, and to receive[1326]
Bothe in substance and in figure
Of gold and selver the nature.
For thei tuo ben thextremetes,[1327]