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Mineral Specimens with Ettringite
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A beautiful matrix piece, rare for the species, with a pinwheel-shaped, 3-dimensional cluster of crystals perfectly centered on matrix. Very aesthetic! They are to 2.5 cm long, starkly contrasting against a rolling carpet of soft white Oyelite (perhaps with Bultfonteinite). The crystals are a pastel almost-lemon-yellow color, translucent, completely formed and free of damage. They have an unusual shimmering surface sheen , very attractive. The matrix is a manganese-rich ore completely covered with a blanket of soft Oyelite (perhaps with Bultfonteinite) deposition on its front side. It is covered on the backside with sparkling micro-hausmannite crystals.
One of the larger good matrix specimens, this is a beautiful matrix piece, rare for the species, with a 3-dimensional cluster of crystals perfectly centered on matrix. Very aesthetic! The crystals are to 3.2 cm long, and the cluster overall is 5.2 cm across. All are starkly contrasting against a rolling carpet of soft white Oyelite. The crystals are a soft, lemon-yellow color, translucent, completely formed and free of damage. They have an unusual shimmering surface sheen , very attractive. The matrix is a manganese-rich ore completely covered on the front by a blanket of soft Oyelite deposition on its front side. It is covered on the backside with BRILLIANTLY sparkling carpet of thousands of micro-hausmannite crystals and a few little metallic hematites. This combination overall is vastly different from anything else I have seen for the species, and quite unusual in any case.
This large matrix cabinet piece features a perfectly situated , doubly-terminated, 5-cm-long crystal perched atop. It is uncanny, how it just hangs there so fully exposed, as if placed gently down, and now anchored by the soft Oyelite and showing both terminations. The crystal is a soft lemon-yellow color, translucent, and complete all around. The matrix is gorgeous and unusual: This is a VERY heavy specimen, as the rolling carpet of soft Oyelite hides a hematite-rich matrix underneath. On the backside , it is nearly covered with sharp bladed barite crystals atop the hematite, unusual for this locality.
This specimen is a robust and colorful piece featuring a 5 x 2 x 2 cm central crystal, 3-dimensional and shooting straight up out of the cluster like a rocket! That crystal is VERY lemon-yellow, translucent, and just plain od in the combination of form and symmetry. It is complete all around, and perfectly terminated, save only a slight natural contact spot to matrix on the right edge face. Other peripheral crystals are not all complete, but add to the overall color and serve to prop up the central crystal. One seldom sees such rich examples of this species. This is a very 3-dimensional piece which has a curving, thin matrix plate as its backbone, from which a cluster of ettringite straddles the center and floats out at the viewer. I think it is a miracle it came out intact. It is actually a floater, complete all around, and with small hematite and hausmannite crystals on the back, all nestled in soft rolling white Oyelite
This piece features a 3 x 1 x 1 cm, perfectly formed and doubly-terminated ettringite hanging precariously (but securely!) on a matrix shard. Aesthetic and unusual!
This is a robust, space-filling miniature that exemplifies the qualities of this find: translucency, shimmering surface lustre, and unusual tapering form. It has a rich lemon yellow color, graded to the pastel and soft tones but still very yellow. The crystal cluster is complete all around, except a slight matrix bit attached to the back edge. It is hard to explain or convey in pictures, but there is a certain ethereal quality to these specimens that makes the crystals look "soft" and unusual compared to most other large crystalline species. And, this is a rather large example for this species.
This is a single, superb, complete crystal from this new pocket. It exemplifies the qualities of this find: translucency, shimmering surface lustre, and unusual tapering form. It has a pastel lemon-yellow color. It is hard to explain or convey in pictures, but there is a certain ethereal quality to these specimens that makes the crystals look "soft" and unusual compared to most other large crystalline species. And, this is a rather large example for this species.
This is a single, fat crystal from this new pocket. It exemplifies the qualities of this find: translucency, shimmering surface lustre, and unusual tapering form. It has a pastel lemon-yellow color. It is hard to explain or convey in pictures, but there is a certain ethereal quality to these specimens that makes the crystals look "soft" and unusual compared to most other large crystalline species. And, this is a rather large example for this species. Unlike some others here, it seems to have a slight brown tinge to it on a few edges, from perhaps iron staining.
This is a single, fat , elongated crystal from this new pocket. It is nicely perched on just a small shard of matrix that serves to stand it up vertically with flair. It exemplifies the qualities of this find: translucency, shimmering surface lustre, and unusual tapering form. It has a pastel lemon-yellow color. It is hard to explain or convey in pictures, but there is a certain ethereal quality to these specimens that makes the crystals look "soft" and unusual compared to most other large crystalline species. And, this is a rather large example for this species. The photo makes it look foreshortened in order to show the termination well. In person, it is rather more vertical in appearance.
This is a single, fat crystal from this new pocket. It exemplifies the qualities of this find: translucency, shimmering surface lustre, and unusual tapering form. It has a pastel lemon-yellow color. It is hard to explain or convey in pictures, but there is a certain ethereal quality to these specimens that makes the crystals look "soft" and unusual compared to most other large crystalline species. And, this is a rather large example for this species in any case
This is a single, fat ,elongated crystal from this new pocket. It exemplifies the qualities of this find: translucency, shimmering surface lustre, and unusual tapering form. It has a pastel lemon-yellow color. It is hard to explain or convey in pictures, but there is a certain ethereal quality to these specimens that makes the crystals look "soft" and unusual compared to most other large crystalline species. And, this is a rather large example for this species in any case. It is certainly beautiful and dramatic in a case!
A bizarre, striking miniature that is just a gob of fat yellow color at first glance. It sits flat on its own, and is complete all around except only a slight contact of attached matrix in back. It almost "glows", it is so oddly pastel and translucent. It exemplifies the qualities of this find: translucency, shimmering surface lustre, and unusual tapering form. It has a pastel lemon-yellow color. It is hard to explain or convey in pictures, but there is a certain ethereal quality to these specimens that makes the crystals look "soft" and unusual compared to most other large crystalline species.
This cute miniature has crossing crystals, the largest 3.6 cm long, arranged like a bowtie at the front of a knob of matrix. The matrix is coated by a rolling carpet of soft white oyelite, and micro-hausmannites. The crystals have good lemony yeloow color, translucency, shimmering surface lustre.
This unusual elongated crystal specimen appears to consist of a white charlesite crystal with an outer layer of powdery-lemon-yellow ettringite atop, from what i am given to understand about how these species form in a related series. The outer layer of colored ettringite is very thin, under 1 mm, and most of this crystal is therefore clear and colorless. It is slightly etched and matte compared to other crystals here. I am sure all in this pocket are zoned in some degree to charlesite and/or sturmanite but this one is distinctly different, with the totally clear core showing so well. Charlesite is a close relative of sturmanite and ettringite, and my understanding is that most crystals of either of the two yellow and more common species are actually zoned, and are thus partial charlesite. However, this crystal seems to have a pure, clear core which i suspect is charlesite, perhaps pure. (not analysed). Unusual, in any case!
A sharp 2.6-cm-long, doubly-terminated crystal sits atop this richly covered matrix knob, overhanging a carpet of sparkling micro-hausmannite crystals. Although not large for the pocket, this is a good matrix ettringite piece of unusual contrast, and one of our few matrix miniatures
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Rob Lavinsky, rob@irocks.com
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share specimen![Ettringite on Oyelite from Nchwaning Mines, Kalahari Fields, South Africa [db_pics/new2010/Ettringite-Kalahari-Namibia-75mm_0597.jpg]](db_pics/new2010/Ettringite-Kalahari-Namibia-75mm_0597.jpg)
![Ettringite on Oyelite from Nchwaning Mines, Kalahari Fields, South Africa [db_pics/new2010/Ettringite-Kalahari-Namibia-75mm_0597close.jpg]](db_pics/new2010/Ettringite-Kalahari-Namibia-75mm_0597close.jpg)
![Ettringite on Oyelite from Nchwaning Mines, Kalahari Fields, South Africa [db_pics/new2010/Ettringite-Kalahari-Namibia-136mm_0762closeup.jpg]](db_pics/new2010/Ettringite-Kalahari-Namibia-136mm_0762closeup.jpg)
![Ettringite on Oyelite from Nchwaning Mines, Kalahari Fields, South Africa [db_pics/new2010/Ettringite-Kalahari-Namibia-136mm_0762.jpg]](db_pics/new2010/Ettringite-Kalahari-Namibia-136mm_0762.jpg)
![Ettringite on Oyelite from Nchwaning Mines, Kalahari Fields, South Africa [db_pics/new2010/Ettringite-Kalahari-Namibia-136mm_0764.jpg]](db_pics/new2010/Ettringite-Kalahari-Namibia-136mm_0764.jpg)
![Ettringite on Oyelite with Barite from Nchwaning Mines, Kalahari Fields, South Africa [db_pics/new2010/Ettringite-Kalahari-Namibia-130mm_0656closeup.jpg]](db_pics/new2010/Ettringite-Kalahari-Namibia-130mm_0656closeup.jpg)
![Ettringite on Oyelite with Barite from Nchwaning Mines, Kalahari Fields, South Africa [db_pics/new2010/Ettringite-Kalahari-Namibia-130mm_0656.jpg]](db_pics/new2010/Ettringite-Kalahari-Namibia-130mm_0656.jpg)
![Ettringite on Oyelite with Barite from Nchwaning Mines, Kalahari Fields, South Africa [db_pics/new2010/Ettringite-Kalahari-Namibia-130mm_0655.jpg]](db_pics/new2010/Ettringite-Kalahari-Namibia-130mm_0655.jpg)
![Ettringite from Nchwaning Mines, Kalahari Fields, South Africa [db_pics/new2010/Ettringite-Kalahari-Namibia-100mm_0659.jpg]](db_pics/new2010/Ettringite-Kalahari-Namibia-100mm_0659.jpg)
![Ettringite from Nchwaning Mines, Kalahari Fields, South Africa [db_pics/new2010/Ettringite-Kalahari-Namibia-50mm_0677.jpg]](db_pics/new2010/Ettringite-Kalahari-Namibia-50mm_0677.jpg)
![Ettringite from Nchwaning Mines, Kalahari Fields, South Africa [db_pics/new2010/Ettringite-Kalahari-Namibia-50mm_0678.jpg]](db_pics/new2010/Ettringite-Kalahari-Namibia-50mm_0678.jpg)
![Ettringite from Nchwaning Mines, Kalahari Fields, South Africa [db_pics/new2010/Ettringite-Kalahari-Namibia-50mm_0679.jpg]](db_pics/new2010/Ettringite-Kalahari-Namibia-50mm_0679.jpg)
![Ettringite from Nchwaning Mines, Kalahari Fields, South Africa [db_pics/new2010/Ettringite-Kalahari-Namibia-52mm_0670.jpg]](db_pics/new2010/Ettringite-Kalahari-Namibia-52mm_0670.jpg)
![Ettringite from Nchwaning Mines, Kalahari Fields, South Africa [db_pics/new2010/Ettringite-Kalahari-Namibia-52mm_0673.jpg]](db_pics/new2010/Ettringite-Kalahari-Namibia-52mm_0673.jpg)
![Ettringite from Nchwaning Mines, Kalahari Fields, South Africa [db_pics/new2010/Ettringite-Kalahari-Namibia-58mm_0688.jpg]](db_pics/new2010/Ettringite-Kalahari-Namibia-58mm_0688.jpg)
![Ettringite from Nchwaning Mines, Kalahari Fields, South Africa [db_pics/new2010/Ettringite-Kalahari-Namibia-58mm_0688-2.jpg]](db_pics/new2010/Ettringite-Kalahari-Namibia-58mm_0688-2.jpg)
![Ettringite from Nchwaning Mines, Kalahari Fields, South Africa [db_pics/new2010/Ettringite-Kalahari-Namibia-49mm_0690.jpg]](db_pics/new2010/Ettringite-Kalahari-Namibia-49mm_0690.jpg)
![Ettringite from Nchwaning Mines, Kalahari Fields, South Africa [db_pics/new2010/Ettringite-Kalahari-Namibia-58mm_0701.jpg]](db_pics/new2010/Ettringite-Kalahari-Namibia-58mm_0701.jpg)
![Ettringite from Nchwaning Mines, Kalahari Fields, South Africa [db_pics/new2010/Ettringite-Kalahari-Namibia-53mm_0691.jpg]](db_pics/new2010/Ettringite-Kalahari-Namibia-53mm_0691.jpg)
![Ettringite from Nchwaning Mines, Kalahari Fields, South Africa [db_pics/new2010/Ettringite-Kalahari-Namibia-63mm_0699.jpg]](db_pics/new2010/Ettringite-Kalahari-Namibia-63mm_0699.jpg)
![Ettringite from Nchwaning Mines, Kalahari Fields, South Africa [db_pics/new2010/Ettringite-Kalahari-Namibia-40mm_0736.jpg]](db_pics/new2010/Ettringite-Kalahari-Namibia-40mm_0736.jpg)
![Ettringite from Nchwaning Mines, Kalahari Fields, South Africa [db_pics/new2010/Ettringite-Kalahari-Namibia-40mm_0733.jpg]](db_pics/new2010/Ettringite-Kalahari-Namibia-40mm_0733.jpg)
![Ettringite from Nchwaning Mines, Kalahari Fields, South Africa [db_pics/new2010/Ettringite-Kalahari-Namibia-39mm_0662.jpg]](db_pics/new2010/Ettringite-Kalahari-Namibia-39mm_0662.jpg)
![Ettringite from Nchwaning Mines, Kalahari Fields, South Africa [db_pics/new2010/Ettringite-Kalahari-Namibia-39mm_0663.jpg]](db_pics/new2010/Ettringite-Kalahari-Namibia-39mm_0663.jpg)
![Ettringite from Nchwaning Mines, Kalahari Fields, South Africa [db_pics/new2010/Ettringite-Kalahari-Namibia-62mm_0706.jpg]](db_pics/new2010/Ettringite-Kalahari-Namibia-62mm_0706.jpg)
![Ettringite with Hausmannite from Nchwaning Mines, Kalahari Fields, South Africa [db_pics/new2010/Ettringite-Kalahari-Namibia-55mm_0740.jpg]](db_pics/new2010/Ettringite-Kalahari-Namibia-55mm_0740.jpg)