Vasszúlfid

Vasszúlfid, also known as iron disulfide, is a chemical compound with the formula FeS2. It is one of the most common sulfide minerals found in the Earth's crust and is often referred to as pyrite. Pyrite is known for its pale brass-yellow color and its metallic luster, which has led to its nickname "fool's gold" due to its resemblance to gold.

The mineral typically occurs in a variety of geological environments, including sedimentary, metamorphic, and igneous rocks. It can form as disseminated crystals, massive veins, or as concretions. Vasszúlfid is an important mineral in economic geology, as it is often found in association with valuable ores like gold, silver, and copper. While not a primary source of iron, it can be roasted to produce sulfur dioxide for sulfuric acid production.

Structurally, vasszúlfid consists of iron(II) cations and disulfide anions. The disulfide anions are composed of two sulfur atoms bonded together. This arrangement contributes to its crystalline structure and its relatively high density. Vasszúlfid is relatively hard and brittle, making it unsuitable for most decorative purposes despite its appearance. Its presence in coal seams can also lead to acid mine drainage when exposed to air and water.