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Vantasselite

Posted by Harjo Neutkens  
avatar Vantasselite
April 14, 2009 09:01AM
    
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Can you help make this a better article? What good localities have we missed? Can you supply pictures of better specimens than those we show here? Can you give us more and better information about the specimens from these localities? Can you supply better geological or historical information on these localities?

Vantasselite
Al4[OH|PO4]3-9H2O
Orthorhombic

Vantasselite from the Type Locality, Bihain Belgium, FOV 0,8cm© Harjo


In the late seventies on the dumps of an abandoned coticule mine near the small village of Bihain, white micaceous crystals where found that were at first sight identified by collectors as Wavellite. Lateron they were recognised as a new species, and Vantasselite was described by André-Mathieu Fransolet. He published it in 1987: Fransolet, A.-M. (1987) La Vantasselite, une nouvelle espèce minérale du Massif de Stavelot, Belgique. Bulletin Minéralogique, 110, 647-656.
Vantasselite is orthorhombic, and the structure is related to that of Vashegyite and Matulaite. It occurs as fine radiating lamellae up to 8 mm, and as spherical aggregates of free-standing terminated crystals up to 3 mm in diameter (this form is extremely rare !) on metamorphosed argillaceous rocks containing so-called Coticule.
The name of this mineral is in honour or Professor Dr. R. VAN TASSEL, an eminent Belgian mineralogist. He was an active member of the mineral club from Antwerp (Mineralogische Kring Antwerpen). [Rik Dillen]
René Van Tassel died 20 march 2013.


Vantasselite
Belgium
Luxembourg Province, Stavelot Massif, Vielsalm, Bihain


FOV 0,6cm© Harjo
FOV 0,2cm©

Many good specimens have been collected over the years, especially the specimens where Vantasselite is sitting alongside nice light yellow-green Variscite spheres are very nice. Sometimes large plates can be found covered with flat rosettes of Vantasselite. Apart from Vantasselite Wavelite is especially abundant on the dumps. Opportunities for finding good specimens of Vantasselite on the dumps near Bihain are still quite good today and Bihain remains the best locality delivering the best examples of Vantasselite worldwide.
[Harjo Neutkens]


Vantasselite
Belgium
Luxembourg Province, Stavelot Massif, Vielsalm, Ottré


Can anyone help us with information and photographs of specimens from this locality?


Vantasselite
Germany
Hesse, Wetzlar, Weilburg, Esserhausen, Mark Mine


A small abandoned iron mine.
Located near Essershausen, about 5 km SE of Weilburg/Lahn.

Can anyone help us with information and photographs of specimens from this locality?


Vantasselite
Germany
North Rhine-Westphalia, Sauerland, Meschede, Bestwig, Föckinghausen Quarry


Can anyone help us with information and photographs of specimens from this locality?


Vantasselite
Japan
Honshu Island, Kinki region, Mie Prefecture, Iseji


Can anyone help us with information and photographs of specimens from this locality?


[Harjo Neutkens 2009]



Click here to view Best Minerals V and here for Best Minerals A to Z and here for Fast Navigation of completed Best Minerals articles.



Edited 15 time(s). Last edit at 08/13/2013 10:36PM by Harjo Neutkens.
avatar Re: Vantasselite
April 14, 2009 09:06AM
Harjo, I think Ill get a copy of Strunz or Fleischer and start checking off what has been worked on. Good stuff.

Rock Currier
Crystals not pistols.
avatar Re: Vantasselite
April 14, 2009 05:21PM
Harjo,
How much of the stuff was collected? Can they still be collected? How much of the stuff was collected?

Rock Currier
Crystals not pistols.
avatar Re: Vantasselite
April 15, 2009 06:51AM
    
Updated, that is, for Bihain, the TL, for the other localities I need info from others.
avatar Re: Vantasselite
April 15, 2009 08:08AM
Harjo, What we should strive for in these articles besides pictures of the best specimens we can lay our hands on is to capture the expert knowledge that all of us have in certain limited areas. Ideally we would want to get the guys five guys and or dealers who dug and or handled the most specimens of this material and grill them and squeeze out of them all they knew about the mineral. I often find myself guilty of not putting enough "beef" into the articles because I am to lazy to find out who these five guys were and grill them about the mineral from that locality. I find that expert knowledge is usually locality wide rather than just species wide and I can often find the guys or at least know who to ask about who the real experts are for particular localities.

But, we have so much to do here I rationalize that I should not spend too much time on any particular species/locality and it will be far better if we get as much up as we can doing what we can. You notice that the more species/localities we get posted, the more people come through to help with the beef? These people usually know a lot more than the snippets of information they are offering and ideally we should try and wring as much expert knowledge out of them as we can and put it in the articles. I bet if we suddenly put up 500 new articles, we could not keep up with the suggestions for improvement. I am gratified that the Wikipedia process we have started her seems to be working.

Rock Currier
Crystals not pistols.
avatar Re: Vantasselite
April 15, 2009 10:21PM
    
Very true Rock.
Re: Vantasselite
April 23, 2012 02:40AM
This is truly one the better minerals that I liked and enjoyed studying on my own. I have actually looked into this a lot of times already and though things were practically similar to the others, it held onto something a little deeper as you would consider.

A lot of dedicated groups are right within my are and are really interested with this type. But I am not quite sure how a lot of them would hold up.
Re: Vantasselite
August 13, 2013 07:51PM
An actualisation: René Van Tassel died 20 march 2013, see the page of the mineral

Photo of a larger "group" of rosettes from Bihain: [www.mindat.org]
avatar Re: Vantasselite
August 13, 2013 09:53PM
    
Harjo,

Could you add the full names of the authors, date of description and the complete vital dates and places of birth and death as well as some of the contributions made by Dr. Van Tassel? I have been making a pass through the Mindat minerals to make a complete name history of as many minerals as I can. In particular, I have been added complete data sets for phosphates and have progressed as far as the M's.

Best Wishes, Van King
avatar Re: Vantasselite
August 13, 2013 10:35PM
    
Updated (I also updated the reference on the mineral page)
Re: Vantasselite
August 15, 2013 09:27AM
Harjo,

uit de doodsbrief van prof. Van Tassel:

geboren te Antwerpen op11 mei 1916
gestorven te Mortsel op 20 maart 2013
Em. Prof. Dr. Kristallografie KUL (= Katolieke Universiteit Leuven)
Mineraloog aan het Koninklijk Belgisch Instituut voor Natuurwetenschappen
Fellow of King's College Cambridge

Op de webstek van de MKA en bij Rik Dillen kun je nog veel meer vinden. Groeten,

Erik Vercammen
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