umbalite
nounEtymology Named for the Umba Valley of the Tanga Region of Tanzania, the location of the mineral’s first discovery in 1978: Umba + -lite.
1
Usually A variety of garnet consisting of a mixture of pyrope, almandine, and spessartine, having the chemical formula Mg₃Al₂(SiO₄)₃-Mn²⁺₃Al₂(SiO₄)₃, exclusively found in the alluvial deposits of the River Umba, and having a light-pink to purple colour.
2
Usually A gemstone consisting of the mineral umbalite.