[meteorite-list] Meteorite?

From: MexicoDoug <mexicodoug_at_meteoritecentral.com>
Date: Tue, 29 Nov 2011 23:00:42 -0500 (EST)
Message-ID: <8CE7D2BC3BFF7A4-244C-10A367_at_webmail-d159.sysops.aol.com>

Hi Mike and thanks for your opinion. I seem to see some tiny vesicles
but can't be sure; also we can't assume it's metal that's sparkling and
my thoughts are at a density of 3.2 g/mL it is possibly some sort of
basalt. Anyway, it's a very interesting meteorwrong, (assuming it's a
wrong from the streak test which may be at odds with it being basalt
...). Wonder what Randy would think about it; the rock was found in
the midwest not too far from him. It'd be a good one for his great
site. Probably can strike it down as a meteorite by thinking about the
two tone concentric heart it has with dendrites coming out (second
picture). Still puzzled...

Kindest wishes
Doug


-----Original Message-----
From: Galactic Stone & Ironworks <meteoritemike at gmail.com>
To: MexicoDoug <mexicodoug at aim.com>
Cc: Jimski47 <Jimski47 at aol.com>; meteorite-list
<meteorite-list at meteoritecentral.com>
Sent: Tue, Nov 29, 2011 8:34 pm
Subject: Re: [meteorite-list] Meteorite?


Hi Doug and List,

Except for the grain size, it reminds me of some acapulcoites,
visually speaking. And if not for the metal flakes, it reminds me of
a very finely grained angrite.

Best regards,

MikeG

--
Galactic Stone & Ironworks - Meteorites & Amber (Michael Gilmer)
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On 11/29/11, MexicoDoug <mexicodoug at aim.com> wrote:
> Looks like this has been commented on a bit and confirmed as a -
> meteorwrong - and apparently streaked reddish since it is commented
> that a streak test indicated it was probably hematite.  (The color
> isn't mentioned, only that the streak proved it was hematite was
> mentioned.)
>
> just one comment, it would be nice to have these threads in the forum
> since having to sign up on another site if the thread is started there
> twists up the thread ...
>
> here are the interior pictures:
>
> http://www.meteoritejunction.com/download/file.php?id=1121
>
> http://www.meteoritejunction.com/download/file.php?id=1122
>
> Also, this stone is stranger in my opinion than that.
>
> The OP mentions it has a density of around 3.1 g/cc and says that
> hematite has a density of about 2.7 g/cc, and accounts for the higher
> density being caused by metal flakes distributed throughout the 
matrix.
>   Hematite is muich heavier than 2.7 g/cc, after all in broad terms, 
40%
> of its chemical formula is iron so one, ignoring the packing, could
> guestimate the minimum density of hematite at 0.4*(8 g/cc) = 3.2 g/cc,
> but given that the oxide has some weight, hematite ought to have a
> density of between 4-6 g/cc (and they are around 5.2 g/cc for both
> magnetite and hematite, depending on how it 'settles' together).
> Probably the 2.7 g/cc referred to was for quartz terrestrial rocks, 
not
> oxides of iron.
>
> In any case, I wonder if anyone else has experience with metal flakes
> in hematite.  Hematite one of the most highly oxidized forms of iron
> right up there, more than goethite, and what can result when magnetite
> oxidizes further.  I makes me wonder how you could have metal flakes
> survive in a hematite matrix (I don't think this can happen but really
> would like to know if anyone has seen this, for all I know there is a
> common process that can produce this, though I can't imagine what it
> would be unless someone mixed up a batch specially to do it).
>
> ref:
> http://www.meteoritejunction.com/viewtopic.php?f=10&p=2860#p2860
>
> Kindest wishes
> Doug
>
>
>
>
> -----Original Message-----
> From: Jimski47 <Jimski47 at aol.com>
> To: meteorite-list <meteorite-list at meteoritecentral.com>
> Sent: Mon, Nov 28, 2011 3:54 pm
> Subject: [meteorite-list] Meteorite?
>
>
> Hope everyone had a nice holiday weekend. I did some meteorite hunting
> and
> found this stone. I'd like to get some feedback on it.
> _http://www.meteoritejunction.com/viewtopic.php?f=10&p=2860#p2860_
> (http://www.meteoritejunction.com/viewtopic.php?f=10&p=2860#p2860)
>
>
> Cheers,
> Jim K
>
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Received on Tue 29 Nov 2011 11:00:42 PM PST