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Geological Enigmas of Onix Formations
Challenging puzzle for experienced crossword solvers
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Across
  • 1. Pertaining to heated water processes often forming mineral deposits hosting onyx
  • 2. Rock type transformation occasionally related to onyx genesis
  • 3. Chemical class including calcite, key to many onyx deposits
  • 4. Common crystalline form of calcium carbonate found with onyx
  • 6. Surface finish enhancing translucence in ornamental onyx
  • 9. Microcrystalline quartz variety constituting true onyx
  • 10. Distinctive layering characteristic of chalcedony-based onyx
Down
  • 5. Cryptocrystalline silica cousin to onyx with concentric patterns
  • 7. Colloquial term sometimes used for banded varieties of onyx
  • 8. Process transforming limestone into siliceous onyx structures
  • 11. Sedimentary rock frequently associated with natural onyx caves
  • 12. Describes organic remains sometimes embedded within onyx layers
  • 13. Describing crosswise veins or fractures disrupting onyx banding

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