Wiktionary
abswurmbachite
n. (context mineral English) A tetragonal copper manganese silicate mineral with a metallic lustre.
Wikipedia
Abswurmbachite
Abswurmbachite is a copper manganese silicate mineral ((Cu,Mn)MnOSiO). It was first described in 1991 and named after Irmgard Abs-Wurmbach (born 1938), a German mineralogist. It crystallizes in the tetragonal system. Its Mohs scale rating is 6.5 and a specific gravity of 4.96. It has a metallic luster and its color is jet black, with light brown streaks.