Marshrooms?
Enlarged, sharpened from left image.
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Blueberries was the name given by the JPL-engineers to these 5mm large
spherules when they appeared for the first time on images sent by
Opportunity.
On the next press conference this was corrected by the Science
Directory, who declared the color to be not blue, as he emphasized,
but grey or red.
Besides the color, there is something else interesting about these
spherules.
As private NASA-independant researchers published on
alt.sci.planetary, the
Cydonia
Mailinglist
and the
UFO
UpDates Mailinglist, some of these spherules are "growing" on
stems and thereby resembling mushrooms!
With the rock abrasion tool on the rover's robotic arm, some of the
spherules embedded in the sulphur abundant bright rocks has been cut
in half. The arrow on the left picture is pointing to the attached stem of a
halved spherule.
This page is updated soon when new detailed images arrive.
Other pages about this topic:
Source of original data: NASA/JPL MER Raw Image Archive