Pyrite (Iron sulfide) is a type of mineral that resembles gold in its color, and is often found crystallized as cubes, masses, or grains. Pyrite is a very common mineral and you can often see tiny flecks of it in stream gravel. It is also a common replacement mineral, and therefore occurs in many formations. The hardness of pyrite is about 6-6.5 on the Mohs scale.
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