[meteorite-list] Strange Rock Reports

[Sterling K. Webb]

It was my impression that he was searching
for a recent fall from the observed fireball.
Or maybe I got that confused with another
thread. So I posted what recent falls, fresh
falls, would look like.

In the Eastern US, the Midwest, the high
rainfall, the freeze-thaw cycling of winters,
and the high porosity of meteorites pretty
much guarantees that a chondrite will be
transformed, even disintegrated, in short
order.

Deserts are a different story.

Such states have an abnornally high per-
centage of their finds as irons and stoney-
irons. Of the eight meteorites in the 2000
edition of the NHM Catalogue listed for
Pennsylvania, only three (38%) are non-iron,
while 90% or more of the meteorites that
fall there (and everywhere else) are stones.

Why? Stones don't survive in those conditions.


Sterling K. Webb
-------------------------------------------------------------
----- Original Message ----- 
From: "Greg Stanley" <stanleygregr at hotmail.com>
To: <sterling_k_webb at sbcglobal.net>; "Mike Hankey" 
<mike.hankey at gmail.com>; <meteorite-list at meteoritecentral.com>
Sent: Wednesday, September 16, 2009 6:47 PM
Subject: Re: [meteorite-list] Strange Rock Reports




All:

I would say it's not that cut-n-dry.  I have found highly weathered 
meteorites that do not look like the ones Sterling has posted.  I agree 
that the ones Mike posted they are most likely slag and definitely are 
not from a fall, but you never know. I like to keep an open mind.

Most of the meteorites I find on Lake Beds have no fusion crust, are 
often fractured or broken so they have sharp edges.  Even a few are very 
weakly attracted to a magnet due to oxidation.  I found one and it 
looked just like a piece of dark red jasper.  When it felt heavy and 
stuck to a magnet, I knew it was a meteorite.

Good luck Mike and keep at it.

Greg S.

----------------------------------------

> From: sterling_k_webb at sbcglobal.net

> To: mike.hankey at gmail.com; meteorite-list at meteoritecentral.com

> Date: Wed, 16 Sep 2009 18:31:16 -0500

> Subject: Re: [meteorite-list] Strange Rock Reports

>

> THIS is a meteorite that has been on the

> ground awhile, years, decades, centuries,

> millennia? but is only partly degraded.

> It's lost its gloss but it's perfectly plain

> what it is:

> http://astronomy.swin.edu.au/cms/astro/cosmos/M/Meteorite

>

> THIS is a meteorite that just fell only days

> before some sharp-eyed fellow picked it up:

> http://meteoriteguy.com/lamanchaspainfall/lamancha555a.JPG

>

> What you are holding in your hand is SLAG.

>

> I mean, I don't want to be overly blunt here,

> but that's not the kind of rock you want to

> expend effort on finding. Toss it in the question

> mark barrel and go find one like the two pix

> above. You'll be a lot happier...

>

>

> Sterling K. Webb

> ------------------------------------------------------------------

> ----- Original Message -----

> From: "Mike Hankey"

> To: "meteoritelist"

> Sent: Wednesday, September 16, 2009 2:23 PM

> Subject: [meteorite-list] Strange Rock Reports

>

>

> I’ve gotten about six strange rock reports so far which is great! It

> shows the locals know meteorites could be on the ground and they are

> keeping an eye out for them. I have been able to identify most of the

> rocks I’ve seen so far, but this one in particular I’m not sure about.

> If anyone knows what this rock is please let me know. It is very hard

> and magnetic seemed like a lot of metal in it. It is pretty weathered

> and hard to tell if it has a crust on it or not.

>

> http://www.mikesastrophotos.com/wp-content/uploads/2009/09/gideon-rock1.jpg

>

> http://www.mikesastrophotos.com/wp-content/uploads/2009/09/gideon-rock2.jpg

>

> http://www.mikesastrophotos.com/wp-content/uploads/2009/09/gideon-rock3.jpg

>

> http://www.mikesastrophotos.com/wp-content/uploads/2009/09/gideon-rock4.jpg

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