Re: [meteorite-list] Leonard David FYI: damage hand magnets used by amateurs do to meteorites

2023-04-13 Thread John Lutzon via Meteorite-list 


And the other studies, yet to be conceived, to differentiate between the 
object's original magnetism state


until the moment when it was influenced by our planet's magnetic field. 
Easy solution, go to where they


normally habitat and do such studies in situ. Otherwise, go and find all 
you can.



John Lutzon


On 4/12/2023 9:47 AM, Alfredo Petrov via Meteorite-list wrote:
Re the destruction of magnetic data in meteorites by hand magnets, I 
wonder whether the thousands of professionally collected fresh Falls, 
and professionally collected Antarctic Finds, aren't sufficient for 
all the paleomagnetism research that will ever get done? At some point 
the relatively small number of such researchers must get saturated 
with all the diverse samples they have time to study.


And magnets are mainly used on older finds which, I imagine, must be 
less relevant to planetary studies anyway, as they've been on Earth a 
long time, exposed to the Earth's magnetic field, and the influence of 
nearby lightning strikes, etc., hardly sources of reliable data 
anymore. So the worries about this might just be a tempest in a teapot.


On Wed, 12 Apr 2023 at 15:24, AL Mitterling via Meteorite-list 
> wrote:


Greetings,

I have said for a long time that using magnets to test possible
meteorites or use to show laymen that they attract a magnet isn't
such a good idea as the magnetic field is wiped out.

Scientific studies are and will be deterred. Information we might
have gleaned on parent bodies will have to be determined by other
means if at all possible.

I think there are even webpages that suggest using a magnet to see
if a possible sample is attracted and a form of identification.

We need to change our methods.

--AL Mitterling
Mitterling Meteorites

On Tue, Apr 11, 2023 at 1:44 PM Leonard David via Meteorite-list
mailto:meteorite-list@meteoritecentral.com>> wrote:

Leonard David FYI:

Testing the damage hand magnets used by amateurs do to meteorites

https://phys.org/news/2023-04-magnets-amateurs-meteorites.html

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Re: [meteorite-list] Leonard David FYI: damage hand magnets used by amateurs do to meteorites (PDF of Preprint)

2023-04-13 Thread Keith Hicks via Meteorite-list 


 I'm a little surprised  no-one has touched on the subject of employing
the use of a compass needle as a semi-diagnostic tool in the field.The
late Dr Alex Bevan of WAM introduced this to me when I first started
hunting meteorites in the early 1990's and I have carried a compass in my
field kit ever since.The sensitivity of an old fashioned compass needle
to a magnetic field is really quite telling and of course
non-interfering.It's surprising  the different reactions when examining
for instance, two West Australian Eucrites, Millbillillie and Camel Donga
(the latter of which has a. 2-3% iron content).
 Having said all this I do appreciate that an old fashioned compass would 
not necessarily be carried by all in this modern era of GPS navigation
which first became operational with a full constellation of 24 satellites
from about 1993 and later available via cellphone from about 1999.
 As an aside and given the availability and use of modern phone/camera/gps
devices, it would be nice to see more data captured and shared from DCA's
 , although I'm not holding my breath in expectation!

Regards, Keith H.













This issue is not new. I’ve not read the article, but I’m willing to
> bet that it does not address the fundamental problem, being that magnets
> are cheap and do provide useful albeit subjective information. Of course
> education and motivation are key but until someone comes up with a better
> alternative, magnets will never go away. There is a small portable meter
> that tests for magnetic susceptibility built as a proof of concept (shown
> to me by Jerome Gattacceca), but it is presently very expensive. If its
> selling price can be brought down to ~$50 through volume manufacturing,
> then we as a community will start making inroads, but will still take a
> while and require significant effort to train and educate.
>
>
>
> Mendy
>
>
>
> From: Meteorite-list  On
> Behalf Of Paul via Meteorite-list
> Sent: Tuesday, April 11, 2023 9:19 PM
> To: Meteorite-list@meteoritecentral.com
> Subject: Re: [meteorite-list] Leonard David FYI: damage hand magnets used
> by amateurs do to meteorites (PDF of Preprint)
>
>
>
> David Leonard wrote:
>
>> Testing the damage hand magnets used by amateurs do to meteorites
>
>> https://phys.org/news/2023-04-magnets-amateurs-meteorites.html
>
>
>
> The paper is:
>
>
>
> Vervelidou, F., Weiss, B.P. and Lagroix,
>
> F., 2022. Hand magnets and the
>
> destruction of ancient meteorite magnetism.
>
> Journal of Geophysical Research: Planets,
>
> p.e2022JE007464.
>
>
>
> PDF of preprint available at;
>
> https://d197for5662m48.cloudfront.net/documents/publicationstatus/100193/preprint_pdf/1778a5786893d0294c6efbeac6faf4b4.pdf
>
>
>
> Official abstract
>
> https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2022JE007464
>
>
>
> Yours,
>
>
>
> Paul H.
>
>
>
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[meteorite-list] Meteorite Picture of the Day

2023-04-13 Thread Paul Swartz via Meteorite-list 
Thursday, Apr 13 2023 Meteorite Picture of the Day: Caleta el Cobre 022

Contributed by: Jérôme Gattacceca

http://www.tucsonmeteorites.com/mpodmain.asp?DD=04/13/2023
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