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If it is labeled aquarium safe, chances are it is. If you were really concerned, you could do the vinegar test. Drop a bit of vinegar on it and if it reacts, I wouldn't use it.
Other than that, I believe those specific rocks are kind of rough to the touch. You could try running panty hose over the rock. If it snacks or tears... it will probably snag or tear your betta's fins.
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