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Vanackerite

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About VanackeriteHide

04042970015332194325965.jpg
Georges Vanacker behind a big amethyst geode in his house in Bruges (1972).
Formula:
Pb4Cd(AsO4)3Cl
Colour:
Light yellow
Lustre:
Adamantine
Specific Gravity:
7.28 (Calculated)
Crystal System:
Trigonal
Name:
For Georges Vanacker (1923-1992), a Belgian systematic collector. Georges was born in Staden, Belgium, on 12 June 1923. He was a very talented student, fluent in several languages, and mathematics was his favourite playground. His plans to study accounting were thwarted by the Second World War. During the war, Georges took a correspondence course in accounting at the 'Institut de Comptabilité Jules Baude' located in Brussels. Because of the ongoing war, he travelled to Brussels once: for his exams. Immediately after the war, Georges continued his studies, and in 1946 he received a Master's Degree summa cum laude.

At the age of 23, he bought a house in the City of Bruges, Belgium, where he lived for the rest of his life. He married to Dina Pollefeyt and started his own accountancy company. It was, in fact, his wife Dina, who sparked his interest in mineralogy. Dina focused on esthetic specimens, while Georges was more interested in building a systematic mineral collection.

Around 1960, when his collection reached about 300 specimens, Georges felt that his knowledge of mineralogy was insufficient, and he started intensively to learn about mineralogy. He was very keen on networking, and when he needed analyses or information, he frequented the researchers of various universities and research institutes, in particular, the Royal Belgian Institute of Natural Sciences in Brussels. When in 1975 digital information technology emerged, he built a database on his mainframe computer to catalogue his specimens, long before personal computers became available to the collector.

Eventually, his collection consisted of 12,000 catalogued specimens and many thousands more, well documented but uncatalogued specimens. By 1990, he had accrued 2,856 of the 3,600 then known mineral species; nearly 80 %!

He purchased many specimens. And every year, he spent his entire vacation in quarries or mines, especially in Scandinavia. To be sure to get the best possible specimen for his collection, he always tried to buy a small lot instead of just one specimen. In the end, most of the time he kept almost everything. He had numerous contacts with quarry and mine owners worldwide, with mineral dealers, and with professional mineralogists. As an accountant, he kept a record of every single letter, telegram or other forms of written communication.

Around 1990 he distributed the esthetic specimens among his 3 children, and the complete systematic collection was donated to the Royal Belgian Institute of Natural Sciences in Brussels. Georges died of a heart attack, on 11 July 1992.
Cd-substituted, trigonal derivative of mimetite.


Classification of VanackeriteHide

Approved
Approval Year:
2012

Pronounciation of VanackeriteHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of VanackeriteHide

Adamantine
Transparency:
Translucent
Colour:
Light yellow
Streak:
white
Density:
7.28 g/cm3 (Calculated)

Optical Data of VanackeriteHide

Type:
Uniaxial
Comments:
Calculated mean refractive index is 2.04.

Chemical Properties of VanackeriteHide

Formula:
Pb4Cd(AsO4)3Cl
IMA Formula:
Pb4Cd(AsO4)3(Cl,OH)

Crystallography of VanackeriteHide

Crystal System:
Trigonal
Class (H-M):
3 - Pyramidal
Space Group:
P3
Setting:
P3
Cell Parameters:
a = 10.0279(3) Å, c = 7.2965(2) Å
Ratio:
a:c = 1 : 0.728
Unit Cell V:
635.43 ų
Z:
2
Morphology:
Rosettes of thin pseudohexagonal tabular crystals up to 5 mm.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.140 Å(10)
3.290 Å(34)
2.982 Å(100)
2.067 Å(16)
1.944 Å(11)
1.875 Å(8)
1.635 Å(10)
1.523 Å(10)

Type Occurrence of VanackeriteHide

General Appearance of Type Material:
Light yellow rosettes of thin pseudohexagonal tabular crystals up to 5 mm in size on bluish-green thometzekite.
Place of Conservation of Type Material:
Mineralogical Museum of the University of Hamburg, Hamburg, Germany, registration number TS 706
Geological Setting of Type Material:
2nd oxidation zone.
Associated Minerals at Type Locality:

Synonyms of VanackeriteHide

Relationship of Vanackerite to other SpeciesHide

Other Members of this group:
Apatite GroupA group in the Apatite Supergroup which includes hexagonal and pseudohexagonal phosphates, arsenates and ...
Belovite GroupA group in the Apatite Supergroup which includes hexagonal and trigonal phosphates with the M1 site split ...
Britholite Group(REE, Ca)5[(Si,P)O4]3X
Ellestadite GroupA group in the Apatite Supergroup which includes hexagonal and pseudohexagonal sulphato-silicates with the ...
Hedyphane GroupA group in the Apatite Supergroup which includes hexagonal and pseudohexagonal phosphates, arsenates and ...
ParafiniukiteCa2Mn3(PO4)3ClHex. 6/m : P63/m
PliniusiteCa5(VO4)3FHex. 6/m : P63/m

Fluorescence of VanackeriteHide

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for VanackeriteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Schlüter, J., Malcherek, T., Gebhard, G. (2012) Vanackerite, IMA 2011-114. CNMNC Newsletter No. 13, June 2012, page 812; Mineralogical Magazine, 76, 807-817.
Schlüter, J., Malcherek, T., Gebhard, G. (2016) Vanackerite, a new lead cadmium arsenate of the apatite supergroup from Tsumeb, Namibia. Neues Jahrbuch für Mineralogie - Abhandlungen: Journal of Mineralogy and Geochemistry, 193, 79-86.

Internet Links for VanackeriteHide

Localities for VanackeriteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Namibia (TL)
 
  • Oshikoto Region
    • Tsumeb
Schlüter, J., Malcherek, T., Gebhard, G. (2012) Vanackerite, IMA 2011-114. CNMNC Newsletter No. 13, June 2012, page 812; Mineralogical Magazine, 76, 807-817.; Schlüter, J., Malcherek, T. & Gebhard, G. (2016): Vanackerite, a new lead cadmium arsenate of the apatite supergroup from Tsumeb, Namibia. Neues Jahrbuch für Mineralogie - Abhandlungen: Journal of Mineralogy and Geochemistry 193, 79-86.
 
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