Ferriorichardite

Ferriorichardite is a rare phosphate mineral with the chemical formula Fe10(PO4)8(OH)2·22H2O. It is named after Ferenc Richard, a Hungarian mineral collector. Ferriorichardite is one of the three minerals, along with ferricoleite and lofffanite, that make up the rhabdophane group.

Ferriorichardite crystallizes in the monoclinic system and typically occurs in the form of needles, prismatic crystals, or tabular crystals. The mineral has a pale blue to pale pink color, and it often exhibits a vitreous luster. Its cleavage is distinctly imperfect in one direction.

Ferriorichardite is found as a secondary mineral in phosphate-rich deposits, such as in uranium-rich sedimentary rocks. Notable occurrences include the Joaquín Mendoza Mine, Coahuila, Mexico, and the mine of La Yacata, Chihuahua, Mexico. Some scientists have also reported the presence of ferriorichardite in gold deposits.

Ferriorichardite's properties have not been studied extensively. However, the mineral is reported to be soluble in strong acids and resistant to decomposition. The formation of ferriorichardite is believed to occur through the alteration of primary phosphate minerals, such as apatite, by iron-rich solutions.

Ferriorichardite is relatively rare, and its study is limited. Research into the mineral continues as scientists seek to understand its properties and behavior better.