Onyx is a type of mineral material deposit, with a crystalline composition, usually a silicate (silicon and oxygen) with color banding from dark to light, often with patterns of dark material.
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- TOS novelization: The Final Frontier
- VOY - Distant Shores short story: "The Secret Heart of Zolaluz"
- ST - Destiny novel: Gods of Night
- TNG - Cold Equations novel: The Persistence of Memory
- TOS novel: The Shocks of Adversity