Pyrite has the nickname "fool's gold" because the brassy yellow color and chunky appearance have fooled a lot of prospectors looking for gold. It is brittle, metallic mineral and is more than 50% sulfur in composition. The surface of pyrite is often grainy, although cubes are also common. Great for science projects or classroom collection. Each piece is irregularly shaped and is between 0.5 and 1 inch in size. Recommended for ages 7 and older.