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Winter campaign at Cook Haven, Sol 3512 - 3599 (December 13, 2013 - March 10, 2014)
SFJCody
post Jan 11 2014, 08:50 AM
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QUOTE (walfy @ Jan 11 2014, 07:41 PM) *
This rock must have popped out pretty far from under the rover's weight. A new record!


Either that or it just fell out of the sky! biggrin.gif tongue.gif

Then again, it does have kind of an iron-y, nickel-y look to it... tongue.gif
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climber
post Jan 11 2014, 12:36 PM
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QUOTE (mhoward @ Jan 11 2014, 03:11 AM) *
So in other words, it probably appeared during the turn on Sol 3540. Neat, huh?

Any chance it was trapped in the weel and released during the turn?Doesn't tell more about the rock but just wondering about this possibility.


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mhoward
post Jan 11 2014, 01:33 PM
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I am guessing - just guessing - that our little friend might have come from here. (She drove over that spot on sol 3512.)

Color version:
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jvandriel
post Jan 11 2014, 04:19 PM
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Here is the Mi cam panorama of that piece of rock from Sol 3541.

Jan van Driel

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nprev
post Jan 11 2014, 05:53 PM
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That's almost more confusing. An encrustation of gypsum, perhaps?


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serpens
post Jan 12 2014, 03:09 AM
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It really is a tiny piece and freshly separated (dust free). When Opportunity next moves it will be interesting to see the area obscured by the left front wheel where I would suspect it originated. A clast separated from the matrix rather than a fractured rock?
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dvandorn
post Jan 12 2014, 05:11 AM
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The pattern of the light-toned mineralization looks like it followed a set of cracks in the rock. Suggests aqueous intrusion to me.

What also catches my eye in this picture are the extremely fine lineations on some of the darker rounded rubble at the bottom of the image. Many of the tiny pebbles have very fine-grained scallops along the edges, others have hair-like, perfectly parallel grooves, some display aligned pits along their rounded surfaces. I'm guessing these are the remains of extremely thin strata, I guess I would find it harder to believe they're carved by eon-long persistent sand particle saltation.

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TheAnt
post Jan 13 2014, 02:16 PM
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My immediate thought were that it might be a small piece of 'fool's gold' (FeS2 compound) but now nprev said gypsum I had a second look and indeed there's a small piece below that might have fallen off and it do look white.
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Zelenyikot
post Jan 14 2014, 08:46 PM
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I'm not sure, but it seems like a coal blink.gif
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serpens
post Jan 14 2014, 09:53 PM
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Probably gypsum although there are other possibilities. An APXS will narrow the field and we will no doubt get the good word in due course. Regardless the deposition implies a fracture which would explain this bit apparently breaking off so easily. There are a couple of displaced fragments of rock evident in mhowards image at post #318, located at the edge of the rock around 205 degrees from Pinnacle Island (taking the top of the image as north) which would seem to define the trajectory.
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RoverDriver
post Jan 14 2014, 10:14 PM
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I'm not a geologist, but is it possible that could it be that it is this and Oppy dropped it?

Paolo


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nprev
post Jan 14 2014, 10:37 PM
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Good one, Paolo!!! laugh.gif (Long time no see, welcome back!)


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marsophile
post Jan 16 2014, 08:49 PM
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Since there is no apparent trail leading to its current position, the rock must have flown through the air a fair distance. It seems difficult to explain how this could be triggered by the rover movement. Have we seen this kind of rover-induced rock mobility before?
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Phil Stooke
post Jan 16 2014, 09:01 PM
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It's on rock. It wouldn't leave a trail.

Phil


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serpens
post Jan 16 2014, 09:35 PM
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Ref my post #333, there are a few displaced 'pebbles' that, on rock, would seem to represent a trail.
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