Crispin, if you refer to the activities in the 80s to combat the
effects of 'the Waldsterben' due to acid rain, that rock was limestone
to mitigate the acidity... and it did help on a short-term basis. the
long-term mitigation though came when they cleaned up the sulfuric
emissions from the high chimneys that caused the acid rain in the
first place.
I presume you have heard about a fad (craze? activity?) in Europe of
walking through damaged forests and adding powdered rock with
several claims made about how that assisted the forest to regain
health.
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