Mineral Specimens with Poldervaartite

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MD-131915 - Poldervaartite - - Archived
N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa
miniature, 4.5 x 3.5 x 1.2 cm.
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Poldervaartite from N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa [db_pics/mdpics/MD-131915a.jpg]

4.5 x 3.5 x 1.2 cm. A more uncommon, translucent and somewhat gemmy red poldervaartite, with sharp crystals to 8 mm. Ex. Charlie Key Collection.

MD-143211 - Poldervaartite - - Archived
N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa
small cabinet, 5.4 x 3.5 x 3.2 cm.
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Poldervaartite from N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa [db_pics/mdpics/MD-143211a.jpg]		CLICK HERE FOR LARGER IMAGE:
Poldervaartite from N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa [db_pics/mdpics/MD-143211b.jpg]

5.4 x 3.5 x 3.2 cm. Stunning 2 cm ball of gemmy deep rich honey-colored Poldervaartite on matrix. The luster is superb, with the many fine crystal faces creating almost a drusy effect, but on a larger scale. A magnificent specimen. Ex. Charlie Key stock.

MD-163187 - Poldervaartite - - Archived
N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa
thumbnail, 2.5 x 2.2 x 1.3 cm.
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Poldervaartite from N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa [db_pics/mdpics/MD-163187a.jpg]

2.5 x 2.2 x 1.3 cm. A beautiful crystal of poldervaartite from the now gone finds of 2003-2004, with riveting color and top luster. Ex. Charlie Key.

MD-174151 - Poldervaartite - - Archived
Wessels Mine (Wessel's Mine), Hotazel, Kalahari manganese fields, Northern Cape Province, South Africa
miniature, 3.7 x 2.5 x 1.7 cm.
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Poldervaartite from Wessels Mine (Wessel's Mine), Hotazel, Kalahari manganese fields, Northern Cape Province, South Africa [db_pics/mdpics/MD-174151a.jpg]

3.7 x 2.5 x 1.7 cm. The poldervaartite crystals on this piece are lustrous, have good color, and are well-formed and very attractively grouped. This is originally from the collection of Ludi von Bezing, a noted collector of Kalahari rarities. Ex. Willy Israel Collection.

MD-178746 - Poldervaartite - - Archived
N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa
thumbnail, 2.9 x 1.6 x 1.5 cm.
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Poldervaartite from N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa [db_pics/mdpics/MD-178746a.jpg]

2.9 x 1.6 x 1.5 cm. A beautiful floater cluster of three gemmy poldervaartite crystals with riveting rose-red color and top lustre. An excellent specimen from the now-gone 2003-2004 finds at the N’Chwaning II Mine. Ex. Charlie Key Collection.

MD-180666 - Poldervaartite - - Archived
N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa
cabinet, 14.9 x 10.5 x 8.8 cm.
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Poldervaartite from N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa [db_pics/mdpics/MD-180666a.jpg]

14.9 x 10.5 x 8.8 cm. Here, poldervaartite fills the seams in a massive manganese-rich matrix; it has a deep orangey-brown color and sparkly luster, and is translucent.

MD-180832 - Poldervaartite - - Archived
N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa
miniature, 4.9 x 2.8 x 1.6 cm.
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Poldervaartite from N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa [db_pics/mdpics/MD-180832a.jpg]

4.9 x 2.8 x 1.6 cm. A superb 2 cm ball of gemmy, lustrous. orange-pink Poldervaartite, set perfectly in a curving piece of matrix. Ex. Charlie Key.

MD-180873 - Poldervaartite - - Archived
N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa
cabinet, 11.2 x 5.7 x 3.1 cm.
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Poldervaartite from N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa [db_pics/mdpics/MD-180873a.jpg]		CLICK HERE FOR LARGER IMAGE:
Poldervaartite from N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa [db_pics/mdpics/MD-180873b.jpg]

11.2 x 5.7 x 3.1 cm. A large, fine plate of gemmy and lustrous Poldervaartites from N’Chwaning. These gemmy crystals range in color from peach to tannish-yellow, but what is extraordinary, besides the sheer number of crystals, is the fact that there are two distinct habits. There are both radial clusters and single blocky crystals that range up to about 1 cm in size. Ex. Charlie Key.

MD-183953 - Poldervaartite - - Archived
N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa
small cabinet, 5.9 x 4.8 x 1.8 cm.
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Poldervaartite from N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa [db_pics/mdpics/MD-183953a.jpg]

5.9 x 4.8 x 1.8 cm. Poldervaartite is a rare nesosilicate known only from the Kalahari manganese mines. This very rich specimen is from the N’Chwaning; it is covered with piled-up, caramel colored, translucent crystals, with tons of sparkle.

MD-183994 - Poldervaartite - - Archived
N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa
miniature, 4.2 x 3.1 x 2.5 cm.
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Poldervaartite from N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa [db_pics/mdpics/MD-183994a.jpg]

4.2 x 3.1 x 2.5 cm. A unique, superb cluster of gemmy poldervaartite crystals with riveting rose-red color and top lustre nicely perched on manganese oxide matrix. The typical crystal ball has a rare, very sharp and gemmy, 9 mm wide crystal attached to it. A fine specimen from the now-gone 2003-2004 finds at the N’Chwaning II Mine. Ex. Marty Zinn Collection #7376.

MD-25808 - Poldervaartite, Calcite - - Archived
N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa
thumbnail, 1.0 cm
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Poldervaartite, Calcite from N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa [db_pics/mdpics/MD-25808a.jpg]

Large, lustrous and translucent ISOLATED medium-brown poldervaartite crystals to 1.0 cm with sparkly, transparent calcite crystals on matrix from the 2001 find at the Wessels Mine. Isolated crystals are nearly unheard of! They almost always come as aggregates. Very choice material. 8.7 x 3.7 x 2.5 cm

MD-27530 - Bultfonteinite, Poldervaartite - - Archived
N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa
large cabinet, 24.0 x 12.2 x 7.4 cm
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Bultfonteinite, Poldervaartite from N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa [db_pics/mdpics/MD-27530a.jpg]

This was the largest and best specimen I have yet seen from a small find of earlier this fall, at the N'Chwaning. This find literally redefines what you can ask for for the species Bultfonteinite, which usually occurs as a botryoidal aggregate (and then often covered by orlymanite) from the locality. THIS FIND, however, presents a significantly new habit for the species in the form of individual, acicular crystals to 7 or 8 mm in size. The white, acicular crystals liberally cover this large and attractive matrix plate which is also rich with small brown poldervaartite crystals. The piece is significant for both quality and size. 24.0 x 12.2 x 7.4 cm

MD-38249 - Poldervaartite - - Archived
N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa
thumbnail, 2.4 cm
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Poldervaartite from N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa [db_pics/mdpics/MD-38249a.jpg]

There are five major clusters of this relatively rare mineral here, the one in the center having the deepest and best color. It has medium lustre but what this specimen lacks in luster is made up for by the size of the clusters – to 2.4 cm across! There is some contact on one of the clusters at the periphery on the bottom, but overall the specimen is in fine shape and presents very nicely with good 3-dimensionality. N''Chwaning poldervaartites are of course HIGHLY sought-after specimens! 6.8 x 4 x 2.5 cm

MD-39028 - Poldervaartite - - Archived
N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa
small cabinet, 6.9 x 5.6 x 2.3 cm
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Poldervaartite from N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa [db_pics/mdpics/MD-39028a.jpg]

An exquisite small cab specimen from the amazing find of about 4 years ago that redefined wha tyou could expect for this species. Now the flood is gone, and superlative specimens like this stand out even more. The crystals here have top lustre and a vibrant sheen to them. The color changes in different lighting through shades of red and orangey-brown, so it is hard to convey in photos what it will look like in your case - but it IS a good specimen I would think impresses more in person , regardless of the difficulty to convey the color in these pics. The major crystal, pristine and undamaged, is a FULL INCH long! The other crystals are of higher translucence as they are smaller, and equally bright and lustrous. If you missed out on the great specimens from the first round some years back, this is the chance to make up for it now! 6.9 x 5.6 x 2.3 cm

MD-40269 - Poldervaartite - - Archived
N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa
small cabinet, 9 x 5.8 x 3.5 cm
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Poldervaartite from N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa [db_pics/mdpics/MD-40269a.jpg]

Rather than the typical rounded clusters, this specimen features isolated, individual crystals measuring up to one centimeter! The lustrous crystals sit on a bed of sparkly calcite. Most are transparent on the edges or at least translucent! A superb specimen, very different from the typical one! 9 x 5.8 x 3.5 cm


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Rob Lavinsky, rob@irocks.com

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