Bruce Murray Space Image Library
Martian Crater Rich in Opal
Filed under mineralogy and petrology, spectroscopy, pretty pictures, Mars, Mars Reconnaissance Orbiter
The CRISM imaging spectrometer on board the Mars Reconnaissance Orbiter identified the minerals present in this crater south of Baldet Crater. Among them: a form of hydrated silica better known as the gemstone opal. The colors of the landscape don't appear as they would to the human eye, because instead of the usual red, green, and blue components of photographs, this image comes from infrared, red, and blue/green sensors.
NASA/JPL/University of Arizona
This image is in the public domain.
Original image data dated on or about April 3, 2007
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