Winter campaign at Cook Haven, Sol 3512 - 3599 (December 13, 2013 - March 10, 2014) |
Winter campaign at Cook Haven, Sol 3512 - 3599 (December 13, 2013 - March 10, 2014) |
Jan 11 2014, 08:50 AM
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#31
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Member Group: Members Posts: 813 Joined: 8-February 04 From: Arabia Terra Member No.: 12 |
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Jan 11 2014, 12:36 PM
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#32
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Senior Member Group: Members Posts: 2920 Joined: 14-February 06 From: Very close to the Pyrénées Mountains (France) Member No.: 682 |
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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Jan 11 2014, 01:33 PM
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#33
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Senior Member Group: Moderator Posts: 3431 Joined: 11-August 04 From: USA Member No.: 98 |
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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Jan 11 2014, 04:19 PM
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#34
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Senior Member Group: Members Posts: 2822 Joined: 22-April 05 From: Ridderkerk, Netherlands Member No.: 353 |
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Jan 11 2014, 05:53 PM
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#35
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Merciless Robot Group: Admin Posts: 8783 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
That's almost more confusing. An encrustation of gypsum, perhaps?
-------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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Jan 12 2014, 03:09 AM
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#36
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Senior Member Group: Members Posts: 1043 Joined: 17-February 09 Member No.: 4605 |
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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Jan 12 2014, 05:11 AM
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#37
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Senior Member Group: Members Posts: 3419 Joined: 9-February 04 From: Minneapolis, MN, USA Member No.: 15 |
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. -the other Doug -------------------- “The trouble ain't that there is too many fools, but that the lightning ain't distributed right.” -Mark Twain
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Jan 13 2014, 02:16 PM
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#38
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Member Group: Members Posts: 495 Joined: 12-February 12 Member No.: 6336 |
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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Jan 14 2014, 08:46 PM
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#39
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Member Group: Members Posts: 215 Joined: 23-October 12 From: Russia Member No.: 6725 |
-------------------- My blog on Patreon
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Jan 14 2014, 09:53 PM
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#40
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Senior Member Group: Members Posts: 1043 Joined: 17-February 09 Member No.: 4605 |
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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Jan 14 2014, 10:14 PM
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#41
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Member Group: Admin Posts: 976 Joined: 29-September 06 From: Pasadena, CA - USA Member No.: 1200 |
-------------------- Disclaimer: all opinions, ideas and information included here are my own,and should not be intended to represent opinion or policy of my employer.
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Jan 14 2014, 10:37 PM
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#42
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Merciless Robot Group: Admin Posts: 8783 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
Good one, Paolo!!! (Long time no see, welcome back!)
-------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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Jan 16 2014, 08:49 PM
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#43
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Member Group: Members Posts: 507 Joined: 10-September 08 Member No.: 4338 |
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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Jan 16 2014, 09:01 PM
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#44
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Solar System Cartographer Group: Members Posts: 10153 Joined: 5-April 05 From: Canada Member No.: 227 |
It's on rock. It wouldn't leave a trail.
Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PD: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
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Jan 16 2014, 09:35 PM
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#45
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Senior Member Group: Members Posts: 1043 Joined: 17-February 09 Member No.: 4605 |
Ref my post #333, there are a few displaced 'pebbles' that, on rock, would seem to represent a trail.
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