Since when do boulders sound like bells when struck with a hammer?

It’s hard to believe we don’t fully understand the secret to these stones’ sonorous properties, but geologists have developed some answers.

Lithophonic rocks don’t possess large amounts of metals as many people speculate. Instead, they ring because they’re stressed out from the pressure of…being a rock.

In the 1960’s, a professor from Rutgers University sawed several rocks from the Pennsylvania field into thin slices. They expanded significantly within 24 hours and no longer rang.

He concluded ringing rocks originated from deep within the earth’s molten interior. Unusual amounts of heat and pressure were exerted upon this magma as it pushed upwards through the softer layers of surface rock. After it cooled and hardened, boulders formed with incredible structural tension within them. Same as guitar strings, different tensions create different frequencies. When a ringing rock is broken, or sawed in this case, tension is released and no more fun with a hammer.

Ringing Rock Park authorities have said these rocks only audibly resonate when amplified through the connecting rocks in the field. This “little white lie” was meant to discourage visitors from taking home these natural wonders. Guys, you can stop with the story already. Only boulders weighing over a ton remain. Nobody is slipping one into their pocket.