Sturmanite, Ettringite
N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa
Miniature, 4.9 x 4.0 x 3.6 cm
A brilliantly yellow, lemon-colored, nearly-2-cm crystal is perched atop a knoll of matrix. The large crystal is sturmanite, and the smaller yellow specks in the matrix are probably ettringite - though often the same crystal may host both species in a transitional mix and its hard to say for sure without proper analysis. Surpassingly aesthetic! These came from a small series of finds, now some 20 years ago, and have not been found in this quality since. 4.9 x 4 x 3.6 cm