Ettringite, Manganite - image 1

Ettringite, Manganite

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Ettringite on manganite, 2.2 cm, from the N’Chwaning II mine, Northern Cape Province, South Africa. Ex Ralph Clark collection; Jeff Scovil photo.

Product details

Species

Ettringite, ManganiteAbout Ettringite →

SizeThumbnail

Dimensions2.2 cm

Added on02/13/2026

Locality

South Africa, Northern Cape, N'Chwaning II MineRegional guide →

Publications

Mineralogical Record Mineral Collecting In Texas page 247

Known provenance

Date	Collector	Acquisition price
—	Ralph Clark	Not disclosed

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Ettringite

Learn about Ettringite

lemon-yellow hexagonal prisms; a fragile hydrated sulfate with notable localities like Kalahari and Eifel, Crestmore, prized by collectors.

Ettringite

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.