Gold nugget turns out to be a four billion year-old meteorite.

"Back in May 2015, an Australian prospector set off to scour the Maryborough Regional Park in search of his fortune, but instead of striking gold, he came across something that was – unfortunately for him – priceless. Intrigued by the density and weight of a slightly odd-looking reddish rock, David Hole spent the next four years attempting to crack open this seemingly impenetrable specimen, only to eventually discover that it was in fact a 4.6-billion-year-old meteorite. Mr Hole stumbled upon the find with the help of a metal detector while digging for gold near Melbourne, in a region that had become synonymous with the precious metal during the 19th-century gold-rush. Hoping to find a nugget inside the rock, he later attempted to access its interior using everything from acid to a sledgehammer, without success.

Baffled as to why the rock was so reluctant to reveal its inner secrets, he decided to take it to the Melbourne Museum, where it was identified as a meteorite. Scientists used a diamond saw to slice off a sliver of the ancient space rock, discovering that it was in fact an H chondrite. The most common type of meteorite, H chondrites contain a high percentage of iron and make up about 40 percent of all meteorites ever found." Read the full article.