Ettringite - image 1

Ettringite

Unknown Owner
Gene Schlepp, J. R. Elks

Product details

Species
EttringiteAbout Ettringite →
SizeMiniature
Dimensions4.0 x 3.0 x 2.5 cm
Added on05/02/2026
Locality
South Africa, Northern Cape, N'Chwaning II MineRegional guide →

Known provenance

DateCollectorAcquisition price
05/2026Unknown OwnerNot disclosed
—DanZ RockshopNot disclosed

Learn more

Ettringite
Mineral guide
Learn about Ettringite
lemon-yellow hexagonal prisms; a fragile hydrated sulfate with notable localities like Kalahari and Eifel, Crestmore, prized by collectors.
Ettringite
Regional guide
Ettringite from N'Chwaning II Mine, South Africa
N'Chwaning II ettringite is one of the great paradoxes of modern mineral collecting: a soft, water-rich cement-mineral species that, at this locality, became a cabinet-level showpiece. The best examples are lemon- to sulfur-yellow, glassy to silky, and sharply hexagonal, often with the kind of saturated yellow that collectors more readily associate with sulfur than with a calcium aluminum sulfate hydrate. On fine crystals the color is not a surface stain but an internal glow, especially in translucent prisms where the broad hexagonal faces show growth zoning, fine striations, and a waxy-gemmy brightness.