Two things shungite's electrons do that ordinary rock-carbon shouldn't: a metal-like EPR signal, and diamagnetism that grows as it cools

The short version

The forum already has threads on shungite conducting electricity. Two peer-reviewed physics papers push that further with findings that simply don't show up in ordinary amorphous carbon. One says shungite's electrons behave like a metal's. The other says shungite repels magnetic fields more as you chill it - the opposite of dull.

1. The metal-like signal

When you put shungite in an electron-paramagnetic-resonance (EPR) machine, the main carbon signal comes out with a Dysonian lineshape - the asymmetric shape you get from conductors (where the microwaves only penetrate a thin skin), not from insulators.

The same 2015 study (Nanoscale Research Letters) also corrected an old assumption: a signal long blamed on fullerene molecules turned out to be oxygen-deficient defect centres in shungite's silica fraction. The carbon clusters themselves came in at about 9-12 nm of well-ordered sp² (graphene-type) carbon. The g-factor sat at 2.0030 - right at the free-electron value, consistent with conduction electrons.

2. Diamagnetism that grows in the cold

A 2004 paper in the journal Carbon measured shungite's magnetic response across temperature and found something not previously reported for any natural amorphous carbon: its diamagnetism (the gentle pushing-away of a magnetic field) increases between roughly 90 and 150 K. The catch - it only happened in samples whose graphene layers were twisted, up to ~100 nm across, with nanometre pores. Shungite with randomly oriented layers showed nothing.

That temperature-rising diamagnetism is unusual enough that at least one follow-on paper discusses it in the language of high-temperature superconductivity mechanisms. To be clear about register: this is a measured magnetic anomaly in a specific structural form of the carbon, not a claim that you can levitate a shungite stone on your kitchen table.

Why it's worth knowing

Both findings point the same way: shungite's two-billion-year-old carbon is structurally ordered enough to do electronic tricks - metal-like conduction signatures, structure-dependent magnetism - that lab chemists usually have to engineer graphene to reproduce.

Sources

- Krasnovyd S.V. et al. (2015), "Local structure and paramagnetic properties of the nanostructured carbonaceous material shungite", Nanoscale Research Letters 10:78: pmc.ncbi.nlm.nih.gov
- "Diamagnetism of natural fullerene-like carbon", Carbon (2004): sciencedirect.com