How to test for real gold nuggets Manager's Choice
Hold the nugget in the beam of a desk lamp. Turn the nugget, so you can view it from various angles. The color and luster of true gold will remain constant, no matter how it is turned. Fool's gold, though, will show variations in its color and in the brightness of its luster.
Tap a small iron nail into the nugget, using a hammer. If the nugget cracks or any of it crumbles away, it is definitely not gold. Gold can be bent or dented, but it does not crack or crumble.
GoToMeeting™ Free Trial
Attend Your Meeting From Anywhere. Try GoToMeeting ™ Today For Free!
Hold a magnet close to the nugget. Gold will not attract magnets, so if the magnet is drawn to the nugget, the material you have cannot be gold.
Weigh the nugget and compare it with a heavy substance of a similar size, such as a stone. Gold is an extremely heavy metal, almost twice as heavy as lead, for example, so in most circumstances, a nugget of true gold should weigh more than another object of equivalent size. It will certainly weigh more than a copper nugget of the same size.
Drip a single drop of nitric acid onto the nugget. True gold will be unaffected, but a copper substitute will fizz a little and produce green foam. Nitric acid can be obtained from chemical suppliers
Read more: How to Test Gold Nuggets | eHow.com http://www.ehow.com/how_7598758_test-gold-nuggets.html#ixzz1uRT7TWpC
How to Test Gold Nuggets ehow.com
Telling a nugget of gold from a material such as copper, which can be treated to closely resemble it, is not always easy. Chunks of "fool's gold," naturally occurring minerals such as iron pyrite, chalcopyrite or bismutite,...