Ettringite (Kalahari Manganese Fields, South Africa)
N'Chwaning 2 Mine, Kalahari Manganese Fields, South Africa. 30mm x 10mm x 10mm.
It may be small but it is a bright yellow Ettringite. This specimen has been with us a for a year or two and has shown no signs of oxidisation, It's as bright as it was the day it was recovered, boding well for it's future in a collection somewhere.