[meteorite-list] Fw: New Issue: Magnetite crystals in ALH 84001

From: Francis Graham <francisgraham_at_meteoritecentral.com>
Date: Wed, 31 Oct 2007 12:33:16 -0700 (PDT)
Message-ID: <194753.15707.qm_at_web58712.mail.re1.yahoo.com>

Dear List,
   But indeed.
   Are the crystals formed by shock in the form
truncated hexoctahedral?
The magnetite crystals were truncated hexoctahedral, a
type of crystal structure that is optimized for
magnetotaxis by bacteria on Earth.
  It seems like it is always possible to find some
sort of nonbiological physical process that will
reproduce some biologically produced chemical or
crystal. If that's the criterion used to rule out
life, we shall always rule it out.

Francis Graham




--- Jerry <grf2 at verizon.net> wrote:

> more negative evidence for life on mars from shock
> experiments on ALH 84001,
> BUT!!
> Jerry Flaherty
> ----- Original Message -----
> From: "PSRD" <psrd at higp.hawaii.edu>
> To: <PSRDMAIL at soest.hawaii.edu>
> Sent: Tuesday, October 30, 2007 8:17 PM
> Subject: New Issue: Magnetite crystals in ALH 84001
>
>
> > Announcement from Planetary Science Research
> Discoveries [PSRD]
> >
> > New Issue: Tiny crystals of magnetite in Martian
> meteorite ALH 84001 might
> > have been made when shock waves decomposed iron
> carbonate.
> > ---------
> > READ: First summary paragraph for a quick overview
> > PRINT: pdf version
> > VIEW: short slide summary
> > ---------
> > FULL ARTICLE at:
> >
>
http://www.psrd.hawaii.edu/Oct07/magnetite-origin.html
> > ---------
> >
> > PSRD is an educational web site supported by
> NASA's Cosmochemistry Program
> > and the Hawaii Space Grant Consortium to share the
> latest research on
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> bodies.
> >
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> >
> > ---------
> > Jeff Taylor and Linda Martel
> > Hawaii Institute of Geophysics and Planetology,
> > University of Hawaii
> > psrd at higp.hawaii.edu
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Received on Wed 31 Oct 2007 03:33:16 PM PDT