Rock Dust

I am trying too understand the concept of Rock Dust.    
I have plenty of  rocks/stones/pebbles on my property.  Is their any advantage of me crushing the rocks into a powder/ fine grain  and adding it too my vegtable garden  or  using it around my trees or would it just be a complete waste of my time?

 

Generally no.

Your local rocks will have the same minerals that your local soil contains (sweeping generalisation, I know). You get most value by bringing in trace minerals from outside your local rock types. Here we are on chalk. I get very little value by crushing rocks from my area. I spread granite based rock dust (waste from a stone cutting and polishing business) and feel that gives a good complement to the soil type and minerals I already have.

I would say, it depends.

What kind of rocks that you have?

My rocks are mostly limestone.  I don't need any more limestone though someone else's soil might need calcium so for them these rocks might be beneficial.

As decomposing rock material reacts with soil microorganisms and plant material, the rock material releases elements like calcium, magnesium and iron. Remineralization with rock dust is a low-cost, high-impact way to aid in the regeneration of soil by closely mimicking natural geological and biological interactions.

https://www.growingagreenerworld.com/rock-minerals-as-soil-amendments/

Test your soil and see what the analysis says is lacking or in excess (keep an eye on Ca and Mag particularly). Ask for and look at the analysis of the rock dust. If it provides what you lack, and does not add to an excess (like we have of Magnesium here), start applying sparingly with compost and observe. If all goes well, try more incrementally. Test soil again and or look at the mineral profile of what you grow that does not go back into the soil to see what you lose each year and need to replace.