andesite :

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an di sahyt

  • n  a dark grey volcanic rock

  • Preliminary date shows the rock might have been formed more than a billion years ago by a volcano, since it appears to be made of a kind of andesite, the second most common type of .
  • In the subduction volcano, the magma is composed largely of andesite, which is a melt relatively rich in silica, water vapor and other gases.
  • Banderson says, "We believe its composition is similar to a rock on earth called andesite, but further analysis is needed to confirm this.

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