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Gold or Pyrite? 7 Simple Tests to Tell the Difference
When you notice bright, yellow, metallic-looking particles inside a rock, it is natural to wonder whether you have found gold. This is especially common...
How to Identify a Meteorite: 7 Tests You Can Do at...
You find an unusually heavy, dark-colored rock in your backyard, in a field, or while hiking. The moment you pick it up, one question...
Trapiche Sapphire
When people see a six-rayed pattern inside a sapphire, the first thing that usually comes to mind is a star sapphire. But the pattern...