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originally posted by: Phage
Here is a picture of the APXS carried on the rover. Notice the screws around the rim? Notice the inner curve of the rim? Notice how the imprint matches?
mars.jpl.nasa.gov...
The APXS is a "contact instrument" it is is pressed against the material it is analyzing.
originally posted by: draknoir2
I just did a quick experiment with a power supply and some coffee creamer.
The creamer was pretty coarse... I'm thinking dessicated fine powder in an extremely thin atmosphere would yield better results.