My belief in the power of native rock is borne out of decades of working with stone in the landscape. As I set them carefully in a slope, along stream beds and use them as rustic steps, I cultivated a kind of 'rock awareness', and could sense which rocks were amenable to change and which were not.
Sometimes rocks that are brought in from another locale appear out of place or feel just plain odd. I have found that native rocks (those from the same area) are in synchrony with the setting.
As Douglas Wood notes in his wise book for children, Grandad's Prayers of the Earth.: