Ettringite - image 1

Ettringite

Unknown Owner
A large crystal that grades from a pale almost blue to yellow around the tips. The Ettringite is perched on a matrix of black sparkling Hausmannite. Ex. Sandra Gonzales

Product details

Species
EttringiteAbout Ettringite →
SizeSmall Cabinet
Dimensions6.4 x 4.0 x 2.4 cm
Added on12/28/2024
Locality
South Africa, Northern Cape, N'Chwaning II MineRegional guide →

Known provenance

DateCollectorAcquisition price
02/2026Unknown OwnerNot disclosed
—DanZ RockshopNot disclosed

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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.