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Crossing the Dunes at Murray Buttes, Sites 54-, Sols 1353-, May 28 2016-
HSchirmer
post Jan 3 2017, 02:08 PM
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QUOTE (PaulH51 @ Jan 3 2017, 11:19 AM) *
we also appear to have a thin layer of material over the veins. Hopefully someone can enlighten me on how this may have occurred

The "thin layer" strongly resembles reflections from crystal faces in the veins that have been polished by the wind.
If you ever walk along a crushed shale road or driveway at dawn, you see a similar glint from the crystal faces
of shale layers and any inclusions.

The general "sheen" you see on the mudstone polygons is consistent with "pipestone"
fine grained, slightly metamorphosed mudstone/argillite aka (clays, silica, alumina-silicates) aka Catlinite.

It polishes up to a nice glossy finish, you see it in carved stone art from Maori, Haida and US plains Indians.

Generally found as lenses and defined layers within large mudstone outcrops.
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dburt
post Jan 3 2017, 09:02 PM
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QUOTE (Gerald @ Jan 2 2017, 10:44 PM) *
To avoid confusion: Are you talking about grains like these? (rotated 90 degrees to reduce risk of optical illusion)...
If so, those don't look like embedded to me, and may be wind-transported.
Could be e.g. olivine, glass, impactite, or SiO2. We've seen (likely) olivine grains before in the dunes.
Are there obviously embedded well-rounded bright translucent grains, hence evidently clasts or concretions of the rock?

I agree, the ones you show appear to be sitting on or protruding from the rock, and where translucent and greenish, could be wind-transported olivine grains. For embedded, I was thinking of some of the less obvious ones, mainly in the shadowed region, that seem to fade into the rock, depending on how deeply embedded or small they are. If not spherules or mineral clasts, these could be some form of light-colored concretion. Still greater resolution would be nice, in this regard.
dburt
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atomoid
post Jan 4 2017, 02:11 AM
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QUOTE (fredk @ Jan 2 2017, 10:55 AM) *
Crop of the 1526-52 rlb series. This shows more travelling ripples and how the wheel track and debris from a moved rock are erased and overrun by the ripples:
[attachment=40603:1526_52_rlb.gif]

Wow!! what have perhaps inadvertently become time lapse frames in Fredk's hands provide a rare and really quite astonishing glimpse into how the airflow and sand movement is actually behaving! .. now if they could purposefully set up some sequences like this using mastcam pairs, i suspect the result could be quite instructive..

also throwing in an unrelated color crosseye of the mudcrackers from sol1566.
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PaulH51
post Jan 4 2017, 09:44 AM
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1568 R-MastCam of an interesting outcrop. Also features several 'grey' items that could be additional meteorite fragments / hematite balls etc?

They appear to be getting fairly common in this relatively small location? smile.gif
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Sean
post Jan 4 2017, 10:45 AM
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Sol 1384 ML



Extended sky


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PaulH51
post Jan 4 2017, 11:03 AM
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QUOTE (Sean @ Jan 4 2017, 06:45 PM) *
Sol 1384 ML

Stunning smile.gif That's a 'Keeper' Sean smile.gif


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Sean
post Jan 4 2017, 12:47 PM
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Thanks Paul, very little to improve on PDS images...

Here is another view of the approach, this time stitching two image sequences together...

Sol 1384 ML 002



Minor foreground patches.


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HSchirmer
post Jan 4 2017, 03:55 PM
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QUOTE (PaulH51 @ Jan 4 2017, 10:44 AM) *
1568 R-MastCam of an interesting outcrop.


Even more interesting are the holes and shadows, which means the "pizzelle weathering" isn't a trick of the light.
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atomoid
post Jan 5 2017, 12:16 AM
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Stroopwafels may have stood up to weathering a bit better! wacko.gif ....crosseye of mudstone revelaing some sand movement and protruding artifact using sol1566 and sol1568 views
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PaulH51
post Jan 5 2017, 01:33 PM
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No plan for 1570 yet, so can't even take a guess at a name of this interesting RMI target, context MAHLI image from 1566 (rotated)


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Ant103
post Jan 6 2017, 03:43 PM
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Stunning Sean smile.gif

Best wishes for 2017, and I'm starting with some routine Navcam pan taken on Sol 1571 :



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Phil Stooke
post Jan 6 2017, 05:38 PM
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Very nice, Damia -here is a circular version to show the location among the sandy patches.

Phil

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... because the Solar System ain't gonna map itself.
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atomoid
post Jan 6 2017, 11:51 PM
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this sol1571 image stands out, looks as if the dust is pushed out from the central area, it looks as if it has received laser hits that cold be responsible for this.. the same area is covered pre-laser in this sol1570 Mahli at lower right, rotated a bit.
Nice closeup of other laser damage in this sol1570 shot
Here is a beautifully exposed sol1570 MAHLI of the previously mentioned rmi target

Also, this sol1570 MAHLI shows at near top what looks to be a somewhat significant crystal complete with facets? ..or a reflection/refraction trick? if only this image showed a bit higher up it would serve as a closeup. fwiw i made a crosseye of the pair retaining the 'crystal' in the left image. edit: found another pair from sol1569 that doesn't have much parallax but it shows up in both, here's a stereo excerpt.
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jvandriel
post Jan 8 2017, 03:51 PM
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The complete Navcam L view on Sol 1571.

Jan van Driel.

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fredk
post Jan 8 2017, 11:19 PM
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Sand movement near the "marble" (I measure 8.4 mm diameter) between 1555 and 1571:
Attached Image

(I haven't removed some distortions due to slightly different imaging locations.)

Edit: all we see here looks like sand movement due to wind (apart from the distortion), just as we've seen elsewhere in this area.
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