OBSIDIAN

/ˌɒbˈsɪd.i.ən/ Scrabble 11 Words With Friends 13

Scrabble letter values: O1B3S1I1D2I1A1N1 = 11

Definition

  1. noun acid or granitic glass formed by the rapid cooling of lava without crystallization.

Examples

  • “usually dark, but transparent in thin pieces”

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