Strashimirite

Strashimirite is a rare monoclinic mineral containing arsenic, copper, hydrogen, and oxygen. It has the chemical formula Cu₈(AsO₄)₄(OH)₄·5(H₂O).

This mineral was discovered in Zapachitsa (Zapacica) copper deposit, Svoge, Sofia Oblast, Bulgaria in 1960, by the Bulgarian mineralogist Jordanka Minceva-Stefanova. She named the mineral after Strashimir Dimitrov (1892-1960), Professor in Mineralogy and Petrography at Sofia University "St Kliment Ohridski", Bulgaria. The International Mineralogical Association approved it as a new mineral in 1968.