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The best sauna rocks are actually igneous rocks which come from cooled lava. Yes, that does cover a variety of rocks from granite (which are too heavy) to pumice (too light), but there exists a special type of dark-colored volcanic rocks which are juuust right.he Rocks and your Sauna Heater. Once you have the right stones, you must remember not to operate the heater without the rocks in the tray. Size is important too. The sauna rocks should be about the size of your fist or a large potato.
If the rock temperature is too low, the sauna will just steam up, and the water will bubble on the top of the rocks. At the correct temperature the rocks will turn red when heated and when you throw water over them they will sizzle, followed by a blast of steam (You won't see the steam of course.ther rocks, for example freshly quarried black basalt, are also excellent for sauna. And the contrast between the stones and the pale wood of the sauna walls looks pretty good too. Now that you found your perfect sauna stone, you can relax. Well not quite yet, since you still haven't considered the size and the shape.