[meteorite-list] Meteorite?

From: Galactic Stone & Ironworks <meteoritemike_at_meteoritecentral.com>
Date: Wed, 30 Nov 2011 00:17:15 -0500
Message-ID: <CAKBPJW-ETE65VNeTGwXBpn=Gw0AeZUNzBUp_FL0ZK7L58+2k8Q_at_mail.gmail.com>

Hi Doug,

What is the average density of angrites? I know acapulcoites are much
more dense than this specimens, but angrites tend to be a little less
dense if I recall correctly. I don't remember the exact number though
and can't find it readily.

I've seen a few bizarre wrongs in my time. I also had a black
unclassified stone that was almost definitely a meteorite, but had a
similar-looking matrix - very black with metal flecks. It also had a
black exterior - desert varnished and wind polished, but you could
tell the original coloration of the entire stone was black (not just
the crust). I sliced that one up and sold it, and now I wish I had
kept it for classification.

I have a few wrongs right now that are dead-ringers for wind-polished
H-type chondrites, but they have no metal in the matrix, the density
is wrong, and they bleed red when cut - likely hematite.

Do you have a link to an exterior shot of the wrong you posted, or did
I overlook it?

Best regards,

MikeG

-- 
Galactic Stone & Ironworks - Meteorites & Amber (Michael Gilmer)
Website - http://www.galactic-stone.com
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On 11/29/11, MexicoDoug <mexicodoug at aim.com> wrote:
> 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)
>
> Website - http://www.galactic-stone.com
> Facebook -  http://tinyurl.com/42h79my
> News Feed - http://www.galactic-stone.com/rss/126516
> Twitter - http://twitter.com/galacticstone
>
>
>
> 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 Wed 30 Nov 2011 12:17:15 AM PST