First I've heard of it.

Googling 'mineral macedonia' gives 43,000 hits. Googling 'mineral macedonia "age of the sun"' gives a big fat zero. FWIW.

It does sound, however, like someone trying to perpeuate an urban myth, old or just-begotten. I's have to say I'm sceptical. Interested, but still sceptical. I'll keep the ears open, though.

But then, I don't generally get first reports, I just remember having read about it in Scientific American once upon a time, or maybe Godel Escher Bach. (For example, Sci Am had one of their "How Things Work" pages just a couple of years ago on the subject of automatic gas-pump shut-off valves...)