Space/Science — HabitableZone

Space/Science » in reply to Since when has gypsum and calcite been harder than anodized aluminium?

Then perhaps caliche, which is harder.
Robert Clark — (archived)

I have suggested this as a means to distinguish between the two suggested explanations of the white material found at the Pathfinder site.
Use a Sojourner replica to see which is resistant to scratching by the wheels.

See pages 6 and 9 here:

Pathfinder's Finds.
http://pr.caltech.edu/periodicals/EandS/articles/Pathfinder%20Feature.pdf

Bob Clark

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