If the crystals grow a little, as they did in your picture, you can see the crystal habit typical for pyrite. Pyrite forms little cubes that some times even have some striations on the sides. This is another very good indicator.
If the crystals grow a little, as they did in your picture, you can see the crystal habit typical for pyrite. Pyrite forms little cubes that some times even have some striations on the sides. This is another very good indicator.
RE: How to Tell Fool's Gold from Real Gold