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used in The Lightning Thief

2 uses
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a black or dark-colored volcanic glass; one of the finest raw materials for the chipping of stone tools
  • Looming on the horizon was a palace of glittering black obsidian.
    Chapter 19 (14% in)
  • We all collapsed, exhausted, on the obsidian gravel.
    Chapter 19 (27% in)

There are no more uses of "obsidian" in The Lightning Thief.

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