Ettringite - image 1

Ettringite

M

MIM Museum
0 for sale
Three pale white-yellow crystals on a matrix covered with calcite, gaudefroyite and hematite.

Product details

Species
EttringiteAbout Ettringite →
Added on11/10/2024
Locality
South Africa, Northern Cape, N'Chwaning II MineRegional guide →

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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.