There are claims that the stones at Adam’s Calendar are "phonoliths" or ringing stones

 The "sound frequency" claims surrounding Adam’s Calendar are rooted in the field of archeoacoustics—the study of how ancient structures interact with sound waves. Proponents like Michael Tellinger argue that the stones aren't just markers, but active "technological" components that vibrate with specific frequencies.

1. The "Stone Bell" Phenomenon

The primary claim is that many of the stones at Adam’s Calendar are "phonoliths" or ringing stones.

• The Material: Most of the stones at the site are dolerite (or diabase), an igneous rock known for its density and crystalline structure.

• The Sound: When struck with a smaller stone or a mallet, some of these monoliths produce a clear, metallic "ring" rather than a dull thud. This occurs because the internal crystalline structure of dolerite allows sound waves to travel with very little dampening.

• The Claim: Proponents suggest this property was used for long-distance communication or as a form of "acoustic power" that could be harnessed by the ancient inhabitants.

---

2. Measuring the "Earth's Hum"

Beyond the ringing of individual stones, some researchers claim the entire site exhibits Infrasound and Electromagnetic (EM) anomalies.

• Signal Measurements: Proponents claim to have recorded sound frequencies coming out of the ground within the stone circles that range from very low infrasound to high-frequency signals (reportedly in the GigaHertz range).

• The "Vortex" Theory: It is often claimed that the circular layout of the stones acts as a circular cross-section waveguide, amplifying the natural resonant frequency of the Earth (the Schumann Resonance).

• Electronic Interference: There are numerous anecdotal reports from visitors claiming that their camera batteries drain instantly or that electronic equipment malfunctions when placed inside certain stone "channels."

---

3. Acoustic Levitation Theories

The most extreme claims regarding frequency at Adam’s Calendar involve Acoustic Levitation.

• The Argument: Since there is no evidence of "traditional" wheels or pulleys to move these multi-ton stones, some suggest the ancients used sound resonance to "cancel out" gravity and move the monoliths into place.

• Scientific Status: While acoustic levitation is a real scientific phenomenon (using sound waves to hover tiny particles in a lab), the energy required to lift a 5-ton dolerite monolith via sound is exponentially beyond any known ancient or modern portable technology.

---

4. The Scientific/Geological Rebuttal

Mainstream geologists provide a much simpler explanation for the "ringing" and the "energy" at the site:

• Natural Magnetism: Dolerite is naturally high in iron and magnetite. This explains why compasses might spin or why electronic equipment might behave strangely—it is a localized magnetic interference common in many igneous rock formations, not necessarily a "hidden power grid."

• Thermal Stress: Rocks in the Mpumalanga highveld undergo extreme temperature shifts between hot days and cold nights. This can cause the rocks to develop internal tensions, which enhances their resonant, "ringing" quality when struck.

Feature	Frequency Claim	Geological Explanation
Ringing Stones	Used for ancient technology/energy.	Natural property of dolerite/diabase rock.
EM Anomalies	Proof of a "Power Grid."	Natural magnetic properties of iron-rich ore.
Ground Hum	Signal from the "Mother Culture."	Natural seismic noise or Schumann Resonance.