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the moon rock
http://wiki.answers.com/Q/What_is_the_softest_rock...
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Based on Mohs Hardness scale, Talc would have to be the softest mineral on earth. Impure varieties of talc are also called softstone because they feel slippery and greasy.
http://answers.ask.com/Science/Other/what_is_the_s...
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Talc is the softest mineral.
http://wiki.answers.com/Q/What_was_the_softest_min...
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A. seismosphere. b. mesosphere. c. asthenosphere. or. d. lithosphere.
http://wiki.answers.com/Q/What_is_Earth's_softest_...
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