Jahnsitebearing

Jahnsitebearing is a phosphate mineral with the chemical formula CaMn2+Mg2Fe3+(PO4)3(OH)2. It is a member of the jahnsite group of minerals, which are characterized by their complex layered structures. Jahnsitebearing was first discovered in the Kragero district of Norway and was named in honor of German mineralogist Walter Conrad Jahn. It typically occurs as well-formed crystals, often prismatic or acicular, and can exhibit a range of colors from pale yellow to reddish-brown. The mineral is relatively rare and is usually found in pegmatites and hydrothermal vein deposits. Associated minerals commonly include other phosphates, iron and manganese oxides, and silicates. The crystal structure of jahnsitebearing is monoclinic. It is a relatively soft mineral, with a Mohs hardness of approximately 4.5, and a specific gravity of around 3.1. Its optical properties include a vitreous luster and transparency to translucency. Jahnsitebearing is not of significant economic importance but is of interest to mineral collectors and researchers due to its complex chemical composition and crystal structure.