What is this rosette thingie?

http://marsrovers.jpl.nasa.gov/galle...1P2936M2M1.JPG

Anybody have an opinion on what the sort of radially symmetrical
rosette in the center of the brushed area in this Spirit microscopic
imager photo from Sol 386 might be?

--
John Popelish

John Popelish Feb 5, 10:21 pm show options

Newsgroups: sci.astro
From: John Popelish - Find messages by this author

Date: Sun, 06 Feb 2005 01:21:49 -0500
Local: Sat, Feb 5 2005 10:21 pm
Subject: What is this rosette thingie?
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http://marsrovers.jpl.nasa.gov/galle...0631572EFFA2K1...


Anybody have an opinion on what the sort of radially symmetrical
rosette in the center of the brushed area in this Spirit microscopic
imager photo from Sol 386 might be?

--
John Popelish

No, but it certainly looks interesting. I hope someone can come up
with an explanation.

Regards,

Earthling48

"John Popelish" wrote in message
...
http://marsrovers.jpl.nasa.gov/galle...1P2936M2M1.JPG

Anybody have an opinion on what the sort of radially symmetrical
rosette in the center of the brushed area in this Spirit microscopic
imager photo from Sol 386 might be?

The outer limit of the brushed area is at about five times
the radius of the central rosette and is concentric with it.
There is probably an area near the spindle of the brush that
doesn't get abraded. It's not clear whether the brushing caused
the radial lines but unless they lined it up on them to start,
the fact that they too seem to originate at the centre of the
brushing suggests the tool caused them.

George

In article .com,
Earthling48 wrote:
Anybody have an opinion on what the sort of radially symmetrical
rosette in the center of the brushed area in this Spirit microscopic
imager photo from Sol 386 might be?

--
John Popelish

No, but it certainly looks interesting. I hope someone can come up
with an explanation.

The radiating structure of fine spherules looks very like a
pyrite framboid to me. Common in reduced-atmosphere environments.

--
Aidan Karley,
Aberdeen, Scotland,
Location: 57°10'11" N, 02°08'43" W (sub-tropical Aberdeen), 0.021233

George Dishman wrote:

"John Popelish" wrote in message
...
http://marsrovers.jpl.nasa.gov/galle...1P2936M2M1.JPG

Anybody have an opinion on what the sort of radially symmetrical
rosette in the center of the brushed area in this Spirit microscopic
imager photo from Sol 386 might be?

The outer limit of the brushed area is at about five times
the radius of the central rosette and is concentric with it.
There is probably an area near the spindle of the brush that
doesn't get abraded. It's not clear whether the brushing caused
the radial lines but unless they lined it up on them to start,
the fact that they too seem to originate at the centre of the
brushing suggests the tool caused them.

Yes, the accurate centering of the object was obvious to me, but I
have not seen any similar tool artifact in any other image.

I think they just got lucky at centering what ever this is.

--
John Popelish

Aidan Karley wrote:

In article .com,
Earthling48 wrote:
Anybody have an opinion on what the sort of radially symmetrical
rosette in the center of the brushed area in this Spirit microscopic
imager photo from Sol 386 might be?

--
John Popelish

No, but it certainly looks interesting. I hope someone can come up
with an explanation.

The radiating structure of fine spherules looks very like a
to me. Common in reduced-atmosphere environments.

Thank you for the term. I have seen such formations in Earth
minerals, but was not familiar with the name.

--
John Popelish

John Popelish wrote:
http://marsrovers.jpl.nasa.gov/galle...1P2936M2M1.JPG

Anybody have an opinion on what the sort of radially symmetrical
rosette in the center of the brushed area in this Spirit microscopic
imager photo from Sol 386 might be?


It looks like a cut through a fossil isn't it?

When looking at it, it is obvious. Maybe it is
an incredible "optical illusion", but sorry,
that would be surprising...

Perfectly round, with a radial marks and texture...
Mmm this is very interesting.

"What on mars" has published a good photo of it:
http://www.whatonmars.com

jacob navia wrote:

John Popelish wrote:
http://marsrovers.jpl.nasa.gov/galle...1P2936M2M1.JPG

Anybody have an opinion on what the sort of radially symmetrical
rosette in the center of the brushed area in this Spirit microscopic
imager photo from Sol 386 might be?


It looks like a cut through a fossil isn't it?

When looking at it, it is obvious. Maybe it is
an incredible "optical illusion", but sorry,
that would be surprising...

Perfectly round, with a radial marks and texture...
Mmm this is very interesting.

"What on mars" has published a good photo of it:
http://www.whatonmars.com

I don't believe that this image was captured after any grinding. I
think they just swept the dust away with the grinder brush before
taking these images. Not only is its symmetry interesting, but its
texture is very distinctively different from the rock behind it.

--
John Popelish