- Adirondack (Mars)
MarsGeo
name=Adirondack
caption=An approximatetrue color view of Adirondack, taken by Spirit's pancam.
type=Rock
latitude=14.6
N_or_S=S
longitude=175.5
E_or_W=EAdirondack is the nickname for Mars Exploration Rover Spirit's first target rock. Scientists chose Adirondack to be Spirit's first target rock rather than another rock, called "Sashimi", that would have been a shorter, straight-ahead drive. Spirit traversed the sandy martian terrain at
Gusev Crater to arrive in front of this football-sized rock onJanuary 18 ,2004 , just three days after it successfully rolled off thelander .The rock was selected as Spirit's first target because its dust-free, flat surface is ideally suited for grinding. Clean surfaces also are better for examining a rock's top coating. Scientists named the angular rock after the Adirondack mountain range in
New York . The word Adirondack is Native American and is interpreted by some to mean "They of the great rocks."Spirit's
Mössbauer spectrometer detected a mineral calledolivine , which does not survive weathering well. The lack ofweathering suggested by the presence of olivine might be evidence that the soil particles are finely groundvolcanic material. Another possible explanation is that the soil layer where the measurements were taken is extremely thin, and the olivine is actually in a rock under the soil. Spirit has also returned microscopic images and Mössbauer spectrometer readings of Adirondack taken the day before the rover developed computer and communication problems onJanuary 22 ,2004 . Both are unprecedented investigations of any rock on anotherplanet . The microscopic images indicate Adirondack is a hard,crystalline rock. The peaks large and small in Adirondack'selectromagnetic spectrum reveal that theminerals in the rock includeolivine ,pyroxene andmagnetite - a common composition in volcanicbasalt rocks on Earth.ee also
*
List of rocks on Mars External links
* [http://marsrovers.jpl.nasa.gov/ Official Mars Rovers site]
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