Bultfonteinite and Poldervaartite
SpiritRock Shop
Item # BP061300622

Rare XL Bultfonteinite and Poldervaartite Crystals on matrix
from the N'Chwaning II Mine 2004 Pocket

Museum Specimens
Click on any photo to see a larger version
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Bultfonteinite is transparent and pale pink to colorless and may occur as fan like groups of snowy white
acicular crystals.  Bultfonteinite was discovered at the 480-foot level of the Bultfontein mine in Kimberley,
South Africa in the early 1900’s.
Poldervaartite is only found in the Kalahari Manganese fields in the N'Chwaning and Wessels Mines
and is named after Arie Poldervaart of the Columbia University. It is an extremely rare mineral, found a
few times in the Wessels mine, and again notably in N'Chwaning mine in a very large pocket.  The first
lot to come out in 2002 was all cream color. Around the middle of 2004, the last pocket was found, and
this pocket only had small cream Poldervaartite crystals and white acicular Bultfonteinite crystals.
Poldervaartite is associated with the minerals Henritermierite, Calcite, Bultfonteinite and Hematite.

Poldervaartite Ultraviolet Fluorescence is Deep Red under Short Wave (SW) UV Light.

To the west of Kuruman in the Northern Cape province, South Africa lies the massive manganese
deposits of the Kalahari manganese field which covers at least 1100 square kilometres. These deposits
have become world famous for the large reserves of ores and for the wide range of specimens identified
and classified. There are 140 different species of minerals classified from this locale.

Olmiite is an interesting and rare mineral and was only described and named in 2006. Most crystals now
called Olmiite were originally described as Poldervaartite. The name Olmiite has become accepted for
the majority of the known material. Olmiite is named for Filippo Olmi, an Italian mineralogist.

The difference between Poldervaartite and Olmiite is not visually identifiable. Manganese dominates in
Olmiite and  Calcium  dominates in Poldervaartite. Most of the earlier 1980's and 1990's finds at the
Wessels Mine are Poldervaartite and the later finds from the N'Chwaning II Mine are Olmiite  (Some of
the 2004 pocket did test as Poldervaartite.) Both forms makes for some very unique and interesting
specimens and they are always in high demand by collectors.
XL Bultfonteinite and Poldervaartite Display

This exceptional Extra-Large Display Case specimen of
Bultfonteinite and Poldervaartite was purchased in August of 2004
from a South African mineral dealer. This piece from our personal
collection has many Poldervaartite cream to tan crystals set in a
beautiful acicular display of Bultfonteinite on a sparkling drusi
covered large multiple surface plate. This is an extremely rare and
large specimen....not another one like it in the world! This piece
fluoresces a deep red and white under SW ultraviolet light.

This piece weighs 35 oz or 2.16 lbs (996g)
and measures 7.8 x 5.1 x 3” (19.8 x 12.9 x 7.8cm)
Deep Red Poldervaartite on
White Bultfonteinite under 13W
Way Too Cool SW UV Light.
Photos taken with Nikon
Coolpix L1