Takometrit

Takometrit is a mineral belonging to the arsenate mineral group, characterized by its distinctive chemical composition and crystal structure. It typically forms in the oxidation zones of arsenic-rich ore deposits, often associated with other secondary minerals such as scorodite and arsenopyrite. Takometrit's formula is generally represented as Cu4(AsO4)2(OH)6·H2O, indicating it contains copper, arsenate groups, hydroxide, and water molecules within its crystal lattice.

The mineral forms tabular to give anhedral crystals and displays a variety of colors, mostly green or bluish-green, owing to its copper content. Its crystalline structure belongs to the monoclinic system, with well-defined crystal faces in some specimens. Takometrit has a relatively low hardness on the Mohs scale, approximately 2.5 to 3, and exhibits a vitreous luster.

Takometrit was first described in 1969 following its discovery in the Takometri deposit in Finland, which is the namesake of the mineral. Since then, it has been identified in various other localities worldwide, typically in regions with significant copper and arsenic mineralization.

The mineral's significance lies in its role as an indicator mineral for geologists exploring arsenic and copper mineralization. Due to its arsenate content, takometrit also raises environmental considerations, as arsenic-bearing minerals can pose risks of contamination. Its unique properties make it of interest within mineralogical and geochemical research, particularly in understanding secondary mineral formation and arsenic cycling in geological environments.

Overall, takometrit is valued for its aesthetic appearance, mineralogical rarity, and scientific interest in geochemical processes.