[meteorite-list] Are Mars Meteorites Magnetic?

From: Göran Axelsson <axelsson_at_meteoritecentral.com>
Date: Sat, 07 Jan 2012 10:36:29 +0100
Message-ID: <4F08121D.3090903_at_acc.umu.se>

Hi list and everyone!

Pete, I don't agree with you. permeability is not a good term. If you
want to have a correct term then use ferromagnetism.

Permeability by itself isn't the correct term, you need to use "magnetic
permeability" to make it correct because permeability is just a general
word and is used in a number of expressions. Permeability is only the
term of how easily something flows through something, magnetic fields,
fluids, gases, ions in cell membranes...
For example an achondrite can have a very high permeability for water
and a low magnetic permeability. In other words, an achondrite can be
very porous and allow water to seep through it and not showing any
ferromagnetism.

It is like talking about density and dense. Everything has a density but
iron meteorites are dense.
Everything have magnetic permeability but iron meteorites have strong
ferromagnetism.

http://en.wikipedia.org/wiki/Ferromagnetism

Personally I will continue to use the more relaxed term of magnetic and
then explain it "Just like a piece of iron that is attracted by a
magnet." if the listener doesn't understand what I mean.

Disclaimer : I'm only a physicist so what do I know... ;-)

/G?ran

pshugar at messengersfromthecosmos.com skrev 2012-01-06 02:25:
> 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 Sat 07 Jan 2012 04:36:29 AM PST