Fourmanierite is a rare and distinct mineral that belongs to the sulfide mineral group. It is named after Maria Rosa Fourmadiere, an Italian mineralogist. This mineral usually occurs in hydrothermal vein deposits associated with cobalt-nickel ores. It has a chemical formula of Cu3Pb(Sb,As)S4 and is typically composed of copper (Cu), lead (Pb), antimony (Sb), and arsenic (As) elements, combined with sulfur (S).
Fourmanierite is characterized by its unique crystal structure and physical properties. It typically forms opaque, metallic gray to black prismatic crystals, which can be either elongated or stubby. It displays a sub-metallic to metallic luster, and its streak is black. This mineral has a high density and belongs to the monoclinic crystal system.
Fourmanierite is considered a minor ore of antimony and arsenic, but it is mostly valued for its aesthetic appeal and collectability. It is a relatively rare mineral, with only a few documented occurrences worldwide. It is commonly associated with other minerals such as pyrite, baryte, cobaltite, and erythrite.
Due to its scarcity and limited distribution, fourmanierite is of interest to mineral collectors, researchers, and enthusiasts. Its unique composition and crystal structure make it a fascinating specimen in the field of mineralogy, providing insights into the geological processes that led to its formation.
