Originally posted by blue bird
What than you say about ( hematite) iron ( and we see the color more than we want) in fact protecting organisms from UV radiation?
The Hematite ah yes.... The Hematite is a mystery in many ways. The reason NASA picked that site is because Hematite showed up on their sensors an
area the size of Oklahoma...
landoflegends.us...
Now Hematite (and Goethite) both form spherical concretions. Both minerals are normally formed in the presence of water (these are oxides of iron) but
can be formed volcanically. I have yet to see a volcanic source that forms the spheres though. Also judging by the surrounding rock in the blue berry
fields they have the typical layered look and color of sedimentary rocks. (note: Hematite Fe2O3 is an iron oxide and Goethite FeOOH, which regularily
forms concretions is iron oxide-hydroxide. Goethite is found all over the planet, usually in the form of concretions, stalactic formations, oolites (
tiny round grains cemented together)
Now I have seen many such concretions here on earth... fresh ones dug out of the rock look bluish black to bluish grey.. Here are some from a famous
location in Utah
And here is an Earthly field of blue berries...
Compare the host rock to the one on Mars...
Now in the Martian ones... they appear to be a much brighter blue.. no matter how you adjust the color. ( I have matched images of the berries to
those of the basalt in other images so I am sure I have the color pretty close)
I cannot explain why they are so blue... and then there are the white ones...
NASA calls these "popcorn" (and they call US crazy :puz
Now the "Snail" and the one on a post that you pointed out... the material connecting them appears translucent. At a guess, I am going to say the
white ones are calcite concretions... calcite makes sense as I would expect to find it associated with that type of host rock, and calcite can account
for those translucent joiners...
When I saw your one on the post, it reminded me of something...
Sand Calcite "Sand Spikes" from Imperial Valley, California. These are calcite concretions...on a post
All of this is proof positive that the area was wet, not volcanic...
At least... it satisfies me