FeS2pyriitti
FeS2pyriitti, more commonly known as pyrite or iron disulfide, is a mineral composed of iron and sulfur with the chemical formula FeS2. It is the most abundant sulfide mineral on Earth, found in a wide variety of geological environments, including sedimentary, metamorphic, and igneous rocks. Pyrite is characterized by its pale brass-yellow color and its metallic luster, which often leads to it being mistaken for gold, hence its nickname "fool's gold." The crystal structure of pyrite is cubic, and it commonly forms in well-defined cubic, octahedral, or pyritohedral crystals. It 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