The ringing rocks are situated on a "pluton", an igneous intrusion of volcanic rock under the surface, left by a volcano that erupted 76 million years ago. The iron content of the rocks is 7% or less, suggesting that iron is not a significant source of the ringing.
In fact, science has not succeeded in explaining why the ringing rocks ring. So we'll suggest our own answer: aliens!
You can see even in this video that sometimes hammer strikes do not produce a ringing, but when they do it is a beautiful, clear tone.
See the whole video below, and let us know if you have any theories as to what is causing the ringing!
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