• Ettringite
Sulphates, Nitrates and Borates

Ettringite

$7,500.00   €6,194  £5,500.00 approx.  

This specimen is priced in US dollars, all other prices are approximate.

ID: CC20814
Ettringite is a rare calcium-aluminium sulphate and is one of the iconic minerals from the N'Chwaning Mines in the Kuruman Kalahari Manganese Field of South Africa.  This is a magnificent ex-matrix crystal forming a hexagonal prism with a six-sided pyramidal termination and central pinacoidal apex.  The Ettringite is a translucent, uniform brilliant acidic lemon-yellow, with a semi-transparent near-surface layer within which there is a fabulous satin lustre.  One side of the prism has grown against another crystal and hence has not had space to perfectly develop across three faces, forming a depressed phantom profile across these prism faces.  This is not damage, simply the Ettringite crystal accommodating the available development space.  A beautiful specimen and an exceedingly rare example of such perfect colour and display habit and, of course, its enormous size.

Details

Dimensions
4.4 × 3.7 × 3.0 cm
Categories
Rare Minerals, Sulphates, Nitrates and Borates
Locality
N'Chwaning Mines, Kalahari Manganese Fields, Northern Cape Province, South Africa, Africa

Minerals on Specimen

Minerals on specimen
Ettringite

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