The 3.5-kilogram amber nugget is the biggest piece of rumanite ever found. (Buzău County Museum) =========================================================================== They say one's trash is another's treasure, but a chunk of 'rock' used to keep a door open for decades is a treasure by pretty much any metric you might care to use. The 3.5 kilogram (7.7 pound) stone was found in a stream bed in southeast Romania by an elderly woman, who brought it home and put it to use. Her discovery turned out to be one of the biggest intact chunks of amber in the world, according to a report by El...