[Edit] 
Answer
Depends entirely on the composition of the rock itself. If there is little metal content or water then nothing will happen, the same as a ceramic dish for example. A pourus rock with water content may actually warm up and a rock with high concentrations of conductive metals may cause sparking.
Answer
Try it and see, it's called scientific experimentation.
First answer by ID0410334326. Last edit by ID3654111371. Question popularity: 27 [recommend question]
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Rock in microwave? What is microwave water? Can you microwave a rock? Can you put a tv on a microwave? Can you put yarn in the microwave? Do people explode when put in the microwave? What hppens if you put a cellfhone in a microwave?
