Marcasite
Marcasite may not be one of the most memorable minerals, but still it has its beauty. The name marcasite comes from the Arabic word for a different mineral: pyrite. These two minerals are polymorphs, meaning that they share the same chemical formula - iron sulfide (FeS2) - however, marcasite is created with a different crystal structure. Besides, marcasite and pyrite often appear together and also associated with other minerals, such as galena, sphalerite, dolomite, calcite and fluorite.
Keep reading












