Between 65 million and 250 million years ago, the ammonites ruled the seas. These once very common cephalopods have since slipped into extinction, but in many cases, their shells survived long enough to be fossilised, leaving us with these beautiful, perfect spirals.
The organic material of this particular ammonite, from Siberia, was replaced by Pyrite.
Ammonites are said to help reveal past life and karmic issues, and lend the stability required to work through those issues.
They also engender a strong sense of structure and instinct.