[meteorite-list] ventifacted iron on Earth

From: Göran Axelsson <axelsson_at_meteoritecentral.com>
Date: Wed Jan 19 17:54:33 2005
Message-ID: <41EEE608.3050907_at_acc.umu.se>

It should be iron ore, hematite or magnetite, not iron or iron alloy.
The banding is produced by tectonic motions and it's called folding.

I visited a swedish mine this summer where there were a lot of
banded iron ore. To get a piece off the big rock below took a lot
of work but it's a perfect way to get rid of stress.
After a while I got my piece for my collection and then I just picked
up a number of loose pieces for trade.

A hematite - quartz banded block with my sledgehammer on top.
http://www.geology.neab.net/travel/2004/bergslagen/Striberg-1.jpg
Close up of the banded structure.
http://www.geology.neab.net/travel/2004/bergslagen/Striberg-2.jpg

Theese are sedimentary iron ores and the banded structure is created by
varied conditions during the sedimentation.

There are also hematite - magnetite banded ores that reflects the oxygen
level of the environment, or in other words, the atmosphere.

/G?ran

David Freeman wrote:

>
> Dear List;
> Here we go, lets see if the links are click-able.
> Dave F.
>
> Sorry I'm late, the 2mins became 60 for some problems:(( sorry
>
> The 3 direct links:
>
> http://web.tiscali.it/francesco.moser/1ebaythursday%20040.jpg
> http://web.tiscali.it/francesco.moser/1ebaythursday%20038.jpg
> http://web.tiscali.it/francesco.moser/19lb%20sample%20bif%20polished.jpg
>
> I must add " %20 " in the place of the space.
> Maybe you don't like this, so I prapare 3 other links with " _ "
>
> http://web.tiscali.it/francesco.moser/1ebaythursday_040.jpg
> http://web.tiscali.it/francesco.moser/1ebaythursday_038.jpg
> http://web.tiscali.it/francesco.moser/19lb_sample_bif_polished.jpg
>
> For any questions e-mail me without problem, write you to the
> Meteorite-list for the link, check them before:))
>
> So this piece is Iron (or an Iron alloy??) is 2.870.000.000 years old???
> Like the native Iron Putorano (or Putorana)??
> What is the reason for the waves structures?? The grey one are Iron
> and the dark are some silicated inclusions??
>
> I don't understand, some slice or piece are in auction on Ebay?? Is
> possible to buy a sample of this fantastic rock??
>
> Thanks for the answare. I just check the link, all 6 are right.
>
>
> Ciao
>
> <><><>
>
> Francesco Moser
> http://web.tiscali.it/francesco.moser/
> IMCA #1510 www.imca.cc
> AAT www.astrofilitrentini.it
>
>
> ----- Original Message ----- From: "David Freeman" To: "Moser
> Francesco" Sent: Wednesday, January 19, 2005 6:40 PM
> Subject: Re: [meteorite-list] Re: ventifacted iron on Earth
>
>
>> Three pictures, first two are of 2.87 billion year old banded iron
>> formation South Pass, Wyoming's Goldman Medows formation. Third is what
>> this material polishes like
>> Thank you very much,
>> Dave Freeman
>> mjwy
>>
>
Received on Wed 19 Jan 2005 05:58:16 PM PST