Why the surface near Opportunity has clumped into pebble
shaped mounds is still a mystery. So are the spherical
shaped silica seen in the microscopic images from
Opportunity. Also the sedimentary rock appears to have
almost annual layers of sediments evenly laid down.
It seems unlikely to me that volcanic sediments
would be so uniform.
The photo below from Opportunity shows the finely stratified sedimentary
rock that could be a form of shale
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The spherical clumping can be seen in this photo
Loading Image...![](https://alt.arts.poetry.comments.narkive.com/9WfPapET/so-has-anyone-noticed-the-horned-rock-photo-from-mars:i.5.2.thumb)
shale
Related: Geology
http://www.encyclopedia.com/html/s1/shale.asp
"sedimentary rock formed by the consolidation of mud or clay, having the property of
splitting into thin layers parallel to its bedding planes. Shale tends to be fissile,
i.e., it tends to split along planar surfaces between the layers of stratified rock.
Shales comprise an estimated 55% of all sedimentary rocks. The composition of shale
varies widely. Shales with very high silica content may have been formed when large
quantities of diatoms and volcanic ash were present in the original sediment. Large
numbers of fossils in shales may give them a high calcium content; such shales may
grade into limestones ."
diatom
Related: Microscopic Organisms
http://www.encyclopedia.com/html/d1/diatom.asp
"(diŽetom, -tom) , unicellular organism of the kingdom Protista , characterized by a
silica shell of often intricate and beautiful sculpturing. Most diatoms exist singly,
although some join to form colonies. They are usually yellowish or brownish, and are
found in fresh- and saltwater, in moist soil, and on the moist surface of plants. They
carry chlorophylls a and c and the carotenoid fucoxanthin contained in plastids. They
reproduce asexually by cell division. Some 40,000 species (5,600 living species) are
either bilaterally or radially symmetrical."
The photo from the microscopic imager of Opportunity shows
yet unexplained spherical silica shapes. Could they be fossilized
colonies of diatoms? Or just volcanic glass?
http://www.jpl.nasa.gov/mer2004/rover-images/feb-04-2004/captions/image-3.html
Loading Image...![](https://alt.arts.poetry.comments.narkive.com/9WfPapET/so-has-anyone-noticed-the-horned-rock-photo-from-mars:i.5.3.thumb)
http://www.indiana.edu/~diatom/diatom.html
"The image above is a scanning electron micrograph (JPEG) of Cyclotella stelligera.
Diatoms are unicellular algae generally placed in the family Bacillariophyceae. The
cell walls of these organisms are made of silica, and the varied shapes and beautiful
ornamentation of these walls made the study of the diatoms and related siliceous
organisms a favored pursuit of the microscopical pioneers. The cell wall is also one
of the major reasons why these algae are today a favorite tool of modern ecological
and evolutionary researchers, because the fossils are often well preserved in lake and
marine systems"
And the outside shape of the 'mystery' diatom found on earth
is surprisingly similar to the larger martian spheres seen from
the Opportunity microscopic images.
http://www.indiana.edu/~diatom/secret.html
So far the structural properties of the martial soil near
Opportunity is a mystery. On one hand the soil is an
extremely fine powder where the microscopic spheres
easily press through. Yet the soil on a larger scale is
more cohesive than such a powdery soil should be.
The only conjecture so far is that the odd properties
of the soil are influenced by static electricity in some
way.
But the soil appears to have non random and spherical
structure on both the microscopic and visible scales.
It seems to me these must be due to either electrochemical
reactions or biochemical.
I can't wait till they figure it out!
This mission is getting more interesting every day.
Jonathan
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