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Why These Were Martian Blood Vessels Rather Than Rock Veins.
Wikipedia says “In geology, a vein is a distinct sheet-like body of crystallized minerals within a rock.”(note 1). So, rock veins cannot be tube-like. In fact, no mechanism enables geologic fractures to form branching, curvy and tapering minute tubes, such as these blood vessel remains, found by Mars rover Opportunity: http://www.wretch.cc/album/show.php?i=lin440315&b=20&f=1556763699&p=360
Source of image: http://marsrovers.jpl.nasa.gov/gallery/all/1/m/3200/1M412275798EFFBW__P2955M2M1.HTML
The objects measure less than 1 mm in diameter, as the width of image is 3.2 centimeters.
Note 1: See first sentence in Wikipedia article on geological veins: http://en.wikipedia.org/wiki/Vein_(geology)
Read more at http://wretchfossil.blogspot.tw
Ever seen a fossilized dinosaur blood vessel? No? Thats because blood vessels don’t fossilize….. No tissue does. Bones & shells are the only parts that fossilize because they sit in the ground long enough that the calcium and whatnot starts getting replaced by minerals. Tissue (like blood vessels) on the other hand, rots and decomposes.