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Mineral Specimens with Ettringite
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This somewhat gemmy, translucent crystal is exceptional becaus eyou seldome see LARGER ettringites of this size that have such gemmines,s and retain sharp form, with lustre as well. I've seen many brown ones, few yellow ones. It is complete all around and pristine save for the fact that (perhaps in heat shock) it perfectly cleaved down the middle in transport home form Charlie's, and so what once was a $7500 specimen is now reduced to $1500 to ensure it sells and gets away from me becaus eit is depressing. but it really LOOKS like a pricier rock and displays dramaticaly. I had it shot at the worst possible angle here to catch the join head-on. IN person, the repair is really NOT ovbvious at all, and this remains a significant , rare, and beautiful specimen. 5 x 3.1 x 2.0 cm
A bright lemon-yellow specimen consisting of 2-4mm ettringite crystals perched on a thin shard of matrix, VERY much more 3-dimensional in person! 4.5 x 3.5 x 3.4 cm
This crystal is a doubly-terminated floater, complete all around, and obviously LEMON yellow, the top color. It is sharply hexagonal and just plain striking. From finds in the early 1980s. I cnanot emphasize how impressive this piece is. AND HOW PRISTINE... 3.4 x 2.4 x 1.1 cm
A beautiful large combination specimen of pastel yellow ettringite perched like sprinkles on rounded aggregates of brucite crystals. I think the blue brucite from this mine is highly unappreciated, and frankly undervalued. 9.2 x 8.3 x 6.2 cm
4.3 x 3.8 x 0.9 cm. Ettringite forms as a precipitate from hydrothermal solutions. It is famous from South Africa - represented here by a plate of mixed little euhedral, gemmy hexagonal crystals with small sugary microcrystals.
5.8 x 6.0 x 3.2 cm. Incredibly intense lemon-yellow microcrystals of ettringite liberally draping a crystallized calcite matrix. Overall, just a beautiful piece! Ex. Charlie Key Collection.
2.3 x 1.4 x 0.7 cm. A crust of super-bright yellow crystals of the rare (in crystals) mineral ettringite (Hydrated Calcium Aluminum Sulfate Hydroxide), which forms as a precipitate from hydrothermal solutions. It is best-known and has been found in its best specimens at this locality.
2.0 x 1.8 x 1.5 cm. A SUPERB N’Chwaning II Mine thumbnail. A gemmy, lustrous and striated, sharply hexagonal, light yellow ettringite crystal is very aesthetically attached to calcite matrix. Choice material from the George Elling Collection.
2.5 x 1.9 x 1.3 cm. A gorgeous thumber of FINE ettringite crystals from N'Chwaning - all terminated, with superb bright yellow color and shiny luster! VERY RARE in this quality! From the well-known California collection of Charles Hansen.
4.7 x 2.4 x 1.6 cm. A finger-shaped cast after perhaps a calcite crystal serves as the matrix for being covered, smothered really, in beautiful LEMON-YELLOW, GEMMY ettringite crystals! Gorgeous miniature! Ex. Charlie Key.
8.8 x 8.6 x 5.6 cm. BEAUTIFUL lemon yellow ettringite crystals draped over a matrix of beautiful pastel brucite for an amazing color contrast. The brucite is crystallized on the display face! The color of the lemon yellow ettringite is shocking and in person this whole piece sparkles. Ex. Charlie Key.
2.8 x 2.3 x 1.7 cm. A translucent, fat crystal of ettringite - actually technically this is a layered or zoned crystal with ettringite as a layer on the outside (yellow in color) coating an internal core of charlesite, a related species. Ex. Charlie Key.
3.5 x 2.8 x 2.5 cm. Two gemmy and lustrous, beautifully intergrown, V-shaped, sulfur-yellow ettringite crystals aesthetically set on manganese ore matrix from the famous N’Chwaning II Mine of South Africa. The large crystal is 1.7 cm and is doubly terminated. Excellent and choice material from this famous locality from the Rob Smith Collection.
2.9 x 2.5 x 1.9 cm. An excellent cluster of gemmy and lustrous, sulfur-yellow to brown ettringite crystals from the famous N’Chwaning II Mine. The large 2.2 cm crystal is doubly terminated, complete all-around and is nearly pristine, with only trivial termination edge wear and a slight side contact.
6.9 x 4.9 x 1.1 cm. The rare mineral ettringite (Hydrated Calcium Aluminum Sulfate Hydroxide), closely related to sturmanite, is well-known in specimens from the Wessels locality. It forms as a precipitate from hydrothermal solutions. This is a plate of bright yellow, solid ettringite, crystallized on the surface with the typical nailhead-form crystals.
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Rob Lavinsky, rob@irocks.com
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share specimen![Ettringite from N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa [db_pics/mdpics/MD-120662a.jpg]](db_pics/mdpics/MD-120662a.jpg)
![Ettringite from N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa [db_pics/mdpics/MD-120680a.jpg]](db_pics/mdpics/MD-120680a.jpg)
![Ettringite from N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa [db_pics/mdpics/MD-122297a.jpg]](db_pics/mdpics/MD-122297a.jpg)
![Ettringite, Brucite from Wessels Mine (Wessel's Mine), Hotazel, Kalahari manganese fields, Northern Cape Province, South Africa [db_pics/mdpics/MD-122385a.jpg]](db_pics/mdpics/MD-122385a.jpg)
![Ettringite from Hotazel mine, Hotazel, Kalahari manganese fields, Northern Cape Province, South Africa [db_pics/mdpics/MD-130249a.jpg]](db_pics/mdpics/MD-130249a.jpg)
![Ettringite, Calcite from N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa [db_pics/mdpics/MD-131676a.jpg]](db_pics/mdpics/MD-131676a.jpg)
![Ettringite, Calcite from N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa [db_pics/mdpics/MD-131676b.jpg]](db_pics/mdpics/MD-131676b.jpg)
![Ettringite from Wessels Mine (Wessel's Mine), Hotazel, Kalahari manganese fields, Northern Cape Province, South Africa [db_pics/mdpics/MD-145030a.jpg]](db_pics/mdpics/MD-145030a.jpg)
![Ettringite from N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa [db_pics/mdpics/MD-156364a.jpg]](db_pics/mdpics/MD-156364a.jpg)
![Ettringite from N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa [db_pics/mdpics/MD-158846a.jpg]](db_pics/mdpics/MD-158846a.jpg)
![Ettringite from N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa [db_pics/mdpics/MD-163174a.jpg]](db_pics/mdpics/MD-163174a.jpg)
![Ettringite, Brucite from N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa [db_pics/mdpics/MD-163259a.jpg]](db_pics/mdpics/MD-163259a.jpg)
![Ettringite from N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa [db_pics/mdpics/MD-163266a.jpg]](db_pics/mdpics/MD-163266a.jpg)
![Ettringite, Manganite from N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa [db_pics/mdpics/MD-165202a.jpg]](db_pics/mdpics/MD-165202a.jpg)
![Ettringite from N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa [db_pics/mdpics/MD-166882a.jpg]](db_pics/mdpics/MD-166882a.jpg)
![Ettringite from Wessels Mine (Wessel's Mine), Hotazel, Kalahari manganese fields, Northern Cape Province, South Africa [db_pics/mdpics/MD-168629a.jpg]](db_pics/mdpics/MD-168629a.jpg)