Toenail, 3.0 x 3.0 x 1.6 cm
N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa

Well-crystallized ettringites are uncommon in the first place, but this specimen is notable for the fact that it is a MATRIX specimen. It features a sharp, bright yellow, complete and terminated crystal measuring one centimeter in each direction, perched atop the matrix.