The pyrite is set in a decorative silver setting. The square foxtail chai is 1.2mm thick and 42cm long. I can supply a longer of shorter chain by request.
The name pyrite is derived from the Greek πυρίτης λίθος (pyritēs lithos), "stone or mineral which strikes fire"
In ancient Roman times, this name was applied to several types of stone that would create sparks when struck against steel. Pliny the Elder described one of them as being brassy, almost certainly a reference to what we now call pyrite.