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

[Keith Hicks]

 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 <meteorite-list-bounces at meteoritecentral.com> On
> Behalf Of Paul via Meteorite-list
> Sent: Tuesday, April 11, 2023 9:19 PM
> To: Meteorite-list at 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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