[furins]

- does it have any side effects on the ecosystem?

- does it have any impact on, you know, the farms you're putting it on?

These two questions probably already have an answer: we already grow plants, vegetables, fruit trees on basaltic soils (soils formed by the erosion of basaltic rocks). Some European countries have almost only them, like Iceland, Albania, Montenegro. Usually the crops are excellent, and benefits directly from this natural fertilizer e.g. some Italian wines. These rocks also help to capture water in arid regions, btw. We are also plenty of real world experiments of adding these substances to other ecosystems: every basaltic volcanic eruption distribute a dust cloud around the vent, usually in an area of hundreds km^2, influencing the environment.