A Gem Of A Find – Oldest 'Piece of Earth' Discovered

  Measuring just 200 by 400 microns (about 10 times the width of a human hair on its widest dimension), one would think finding an ancient zircon to be harder than finding a needle in the proverbial haystack…Or, in this case, like finding a nearly microscopic gemstone on a sheep farm in Western Australia. But geologists treasure