WHAT STONES YOU CAN POLISH
Here's a simple and easy way to know. Its recommended that the stones you plan to polish in your rock tumbler to be harder than glass.
A very easy test to confirm if your stones are indeed harder than glass is to lay a piece of glass on a flat surface. Then with firm (not excessive) pressure drag a point of the stone across the glass. A powdery streak will be made. Blow away the powder.
If there is a scratch in the glass the powder was from the glass itself and your stones are good to go!
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