[meteorite-list] Black Onaping (was: Shatter Cone)

[Larry Atkins]

Dan, Bernd, All,

One needs to look closely to see the metal. In fact it wasn't really 
visible until I gave it a good polish.

A little trick I have for determining if the metal or sulphide in a 
rock is responsible for the magnetic attraction is to take a tiny chip 
off a rare earth or neodymium magnet and scoot it around with a 
toothpick, looking to see if it jumps from grain to grain. If you do 
this with a rock that's magnetic and has visible pyrite in it, you will 
see the magnet jump away from the metallic material, (pyrite). Only 
rarely does it jump from metal grain to metal grain. This Black Onaping 
is one of those rare exceptions.

Sincerely,
Larry Atkins

IMCA # 1941
Ebay alienrockfarm


-----Original Message-----
From: Dan Wray <daniel_wray at comcast.net>
To: Bernd V. Pauli <bernd.pauli at paulinet.de>; 
meteorite-list at meteoritecentral.com
Sent: Fri, Jan 14, 2011 10:40 am
Subject: Re: [meteorite-list] Black Onaping (was: Shatter Cone)


Bernd and all, 
 
I have a large collection of impactites from all over the world, yes 
they were caused by meteoritic impact but few have material 
identifiable from the impactor. My Monturaqui contains visible metallic 
grains but I had never thought to check my other impactites. Thus far I 
have only found one other and that is a slice of Ternovka, a black 
material that is quite magnetic. I would be interested to have others 
check their collections for this feature. 
 
Dan 
----- Original Message ----- From: "Bernd V. Pauli" 
<bernd.pauli at paulinet.de> 
To: <meteorite-list at meteoritecentral.com> 
Sent: Friday, January 14, 2011 4:41 AM 
Subject: [meteorite-list] Black Onaping (was: Shatter Cone) 
 
> Hello Larry, Dan, and List, 
> 
>> I do wonder about the metal in the Onaping. 
>> Typically, is there metal in Onaping? 
> 
>> I pulled out my slice of Black Onaping, it is indeed 
>> magnetic in certain spots. This is a revelation. 
> 
> No wonder Black Onaping material is magnetic given the fact 
> that the Sudbury Structure is the result of a meteorite impact. 
> 
> In other words, Black Onaping contains sulfides and nickel(-iferous) 
> inclusions ... hence magnetic! 
> 
> Best wishes, 
> 
> Bernd 
> 
> 
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