Question
I HAVE NOTICED THAT SOME GARDENERS USE LOCAL ROCK QUARRY DUST, BECAUSE IT IS SO CHEAP, 5 OR 6 DOLLARS A TON...IS THIS A SAFE PRACTICE?? I NOW USE AZOMITE, BUT IT IS EXPENSIVE....ROY

Answer
...if it is a limestone quarry, it would make your garden more alkaline....if it were too acid.  Would be like buying lime....

If it is just rock dust:  here is a rock dust primer, and yes it is great for your garden:  http://remineralize.org/a-rock-dust-primer