rautadisulfidi
Rautadisulfidi, also known as iron(III) disulfide or pyrite, is an iron sulfide mineral with the chemical formula FeS2. It is the most common sulfide mineral on Earth and is found in a wide variety of geological environments, including igneous, metamorphic, and sedimentary rocks. Pyrite is characterized by its pale brass-yellow color and its metallic luster, often leading to it being mistaken for gold, hence its nickname "fool's gold." The crystal structure of pyrite consists of iron cations (Fe2+) and disulfide anions (S22−). It typically crystallizes in the isometric system, often forming cubic, octahedral, or pyritohedral crystals, and can also occur in massive, granular, or botryoidal forms.
Pyrite is relatively hard, with a Mohs hardness of 6 to 6.5, and brittle. It has a