(unknown charset) [meteorite-list] Are_Mars_Meteorites_Magnetic?

From: (unknown charset) Prof. Zelimir Gabelica Université de Haute Alsace ENSCMu, <Zelimir.Gabelica_at_meteoritecentral.com>
Date: Fri, 06 Jan 2012 11:07:10 +0100
Message-ID: (unknown charset) <20120106110710.cz3mw5t4ontc8sks_at_www.mail.uha.fr>

Hi Pete,

Your statement that magnetite (Fe3O4) is one part w?stite (FeO) and
one part hematite (Fe2O3) is formally true (in terms of formula
adjustment) but not totally, regarding its physico-chemical properties
and especially its structure, that are different from what would
result in a mechanical admixture of w?stite and hematite.

Magnetite is actually a Fe(II) ferrate(III).

It should be written more correctly as Fe(Fe2O4) where the first iron
is a bivelent cation Fe(II) or Fe2+ that neutralizes an anion which is
(Fe2O4)2- and in which the 2 irons are Fe(III) or Fe3+

As Fe(II) is more electropositive than Fe(III), it preferably acts as
cation while Fe(III) ions would more readily be surrounded by enough
oxygens so as to build up an anion.

This being, I did not check whether the permeability of magnetite
results from that of w?stite or whether it is rather rearranged
otherwise, which should be far more likely in reagrd with the
completely different magnetite structural rearrangement.

Thanks you (and Greg) for your clear discrimination between
"magnetism" and "permeability", that really needed to be reminded.

More precisely, in electromagnetism, permeability is the measure of
the ability of a material to support the formation of a magnetic field
within itself. In other words, it is the degree of magnetization that
a material obtains in response to an applied magnetic field (info from
Wikipedia).

Happy New Year to all!

(In French we use to say "Bonne Ann?e", meaning "Good New Year". But I
prefer by far the English wording. Indeed, it is not beacuse the year
is good that you'll necessarily be happy. It mostly depends on your
mental spirit and your intrinsic optimism. Some may be poor and/or ill
but still very happy.
I therefore wish everybody to acquire a very positive mantal spirit in
any circimstance, so far for this unpredictable 2012...)

Zelimir

-- 
Prof. Zelimir Gabelica
Universit? de Haute Alsace
ENSCMu, Lab. LPI-GSEC,
3, Rue A. Werner,
F-68093 Mulhouse Cedex, France
Tel: +33 (0)3 89 33 68 94
pshugar at messengersfromthecosmos.com a ??crit??:
>
>
> Richard, the List.
> There was a reply asking about magnetite.
> Magnetite is a form of Iron oxide, having the
> formula Fe3O2. The common chemical name is
> ferrous-ferric oxide. The formula for magnetite
> may also be written as FeO?Fe2O3, which is one part
> w?stite (FeO) and one part hematite (Fe2O3).
> It contains Iron, therefore it can be a
> magnet because the iron has a high Permeability.
>
> Alinco magnets were made before rare earth magnets.
> They were made of a mixture of aluminium (Al), nickel (Ni)
> and cobalt (Co) Sometimes copper and titanium were added.
> In their day, these were the strongest magnets that were
> available
>
> Now I'm sure someone will pipe up and ask about
> the rare earth magnets.
>
> There are two types: neodymium magnets and samarium-cobalt magnets.
> Neodymium magnets are made from an alloy of neodymium, iron and
> boron: (Nd2Fe14B). These are the strongest of all the magnets.
> Their only drawback is that they oxidize very eazy unless they
> are covered with a corrosion protection layer of nichol or some other
> material.
>
> The other type of rare earth magnet is samarium-cobalt magnets.
> The chemical formula is SmCo5,
> These are made from samarium and cobalt.
> These magnets are weaker than the neodymium magnets.
>
> I hope this helps to clear up some of the confusion.
> Pete Shugar
>
>
>
>> -------- Original Message --------
>> Subject: Re: [meteorite-list] Are_Mars_Meteorites_Magnetic?
>> From: <pshugar at messengersfromthecosmos.com>
>> Date: Thu, January 05, 2012 7:25 pm
>> To: "GREG LINDH" <geeg48 at msn.com>, bernd.pauli at paulinet.de
>> Cc: meteorite-list <meteorite-list at meteoritecentral.com>
>>
>>
>> Hello list, Greg, Bernd,
>> Yes, everone uses the term magnetic but
>> that is not the proper word for what they
>> are trying to convey.
>> Greg, you are correct in your definition.
>> The correct term is Permeability.
>> Permeability is defined as the ability to be
>> attracted to a magnet.
>> Everything has Permeability, but it is to such
>> a small degree that the object will not stick to
>> the magnet. Almost all living things contain
>> some iron, which makes them have a slight Permeability.
>> There are only three metals with a high enough
>> Permeability to become a magnet. these are
>> iron, nichol, and colbalt. Some stainless steel
>> can have Permeability by deformation, that is, being
>> bent out of shape.
>> If you get bent out of shape, maybe you can be
>> attracted to a magnet. :)
>> A magnet attracts the iron because the iron has
>> Permeability.
>> Magnetic is the term meaning having the properties
>> of a magnet.
>> This is sorta like Meteroid, meteor, meteorite.
>> I'm sorry that I did not get this out sooner, but
>> life got in the way.
>> Pete Shugar
>>
>>
>> > -------- Original Message --------
>> > Subject: Re: [meteorite-list] Are Mars Meteorites Magnetic?
>> > From: GREG LINDH <geeg48 at msn.com>
>> > Date: Tue, January 03, 2012 5:49 pm
>> > To: <bernd.pauli at paulinet.de>
>> > Cc: meteorite-list <meteorite-list at meteoritecentral.com>
>> >
>> >
>> > Hi Bernd,
>> >
>> >   I meant to address this email to you and not to Eric.  So here  
>> it is again.
>> >
>> >   I have always wondered why people here on the List, keep  
>> referring to some meteorites as being "magnetic". To me, being  
>> magnetic means having the properties of a magnet. There are no  
>> meteorites that natually attract iron, so why are they described as  
>> being "magnetic"? Am I wrong?
>> >
>> >
>> >   Regards,
>> >
>> >   Greg L.
>> >
>> >
>> >
>> >
>> >
>> > > From: bernd.pauli at paulinet.de
>> > > To: meteorite-list at meteoritecentral.com
>> > > Date: Tue, 3 Jan 2012 23:36:07 +0000
>> > > Subject: [meteorite-list] Are Mars Meteorites Magnetic?
>> > >
>> > > Eric inquired:
>> > >
>> > > "Are Mars meteorites magnetic at all?"
>> > >
>> > > Some of them are definitely attracted to a magnet!
>> > >
>> > > One of these is Bob Verish's Los Angeles and when I held
>> > > a magnet to one my LAs, it readily jumped to the magnet!
>> > >
>> > > See, for example:
>> > >
>> > > COLLINSON D.W.(1997) Magnetic properties of Martian meteorites:
>> > > Implications for an ancient Martian magnetic field (Meteoritics  
>> 32-6, 1997, 803).
>> > >
>> > > Best wishes for 2012,
>> > >
>> > > Bernd
>> > >
>> > >
>> > > ______________________________________________
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Received on Fri 06 Jan 2012 05:07:10 AM PST