Which preposition to use with stoniness

of Occurrences 1%

Not far from this point, the path from Luz, viâ Villenave, joined in, but no improvement in the general unevenness and stoniness of it was effected.

on Occurrences 1%

In hardness of character it is half-way between the two,having neither the maternal tenderness on the one hand, nor the paternal stoniness on the other.

Which preposition to use with  stoniness