Rynersonite
Appearance
Rynersonite (Ca(Ta,Nb)2O6) is an oxide mineral. It crystallizes in the orthorhombic crystal system. It is dull, translucent mineral, fibrous in nature. Usually off-white to pale pink in color. It occurs in granitic pegmatites and was first described for an occurrence in San Diego County, California in 1978.[1][2][3]
Besides the San Diego, California area, Rynersonite is also found in Colorado and Kampala, Uganda.
References