Hi Mike,
This is the old Vatican bible
( http://dictionary.reference.com/browse/bible definition #4 )
of densities of meteorites:
http://adsabs.harvard.edu/abs/1998M%26PS...33.1231C
plus, the new one which had two angrites:
http://www.lpi.usra.edu/meetings/lpsc2010/pdf/1869.pdf
...and indicates a density of 3.2 g/mL for angrites which you'll like
but I don't have a clue with what accuracy tyhe density of the unknown
was measured.
As for the outside of the rock, it was in the tread referenced in the
other forum, but here's the image direct link:
http://www.meteoritejunction.com/download/file.php?id=1119
which has curious rust-colored spots but still looks basaltish to me.
Very curious, the object
Kindest wishes
Doug
-----Original Message-----
From: Galactic Stone & Ironworks <[email protected]>
To: MexicoDoug <[email protected]>
Cc: Jimski47 <[email protected]>; meteorite-list
<[email protected]>
Sent: Wed, Nov 30, 2011 12:17 am
Subject: Re: [meteorite-list] Meteorite?
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
Facebook - http://tinyurl.com/42h79my
News Feed - http://www.galactic-stone.com/rss/126516
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On 11/29/11, MexicoDoug <[email protected]> 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 <[email protected]>
To: MexicoDoug <[email protected]>
Cc: Jimski47 <[email protected]>; meteorite-list
<[email protected]>
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 <[email protected]> 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 <[email protected]>
To: meteorite-list <[email protected]>
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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