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Geological Enigma: Onix Rock Lexicon
Challenging puzzle for experienced crossword solvers
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Across
  • 1. Red herring: biologically unrelated velvet worm, test solver’s attention
  • 2. Describes minerals with long-range atomic order
  • 3. Texture resembling thin thread-like mineral aggregates
  • 4. Rock type transformed under heat and pressure
  • 5. Microcrystalline quartz that forms many varieties including onyx
  • 9. Quartz variant displaying chatoyancy, named for feline pattern
  • 10. Scientific study of mineral properties and formation
  • 12. Opaque variety of chalcedony often used in ornamental carvings
  • 13. Characteristic parallel layers in sedimentary rock formation
  • 16. Lustrous, glass-like surface quality in minerals
Down
  • 6. Layering structure common in sedimentary and banded stones
  • 7. Visual texture resembling network fractures in stones
  • 8. Type of rock formed by accumulation of mineral and organic particles
  • 11. Refinement process revealing banded patterns in gemstones
  • 14. Process of successive mineral layering or changes
  • 15. Polymorph of calcium carbonate distinct from calcite
  • 17. Sedimentary rock primarily composed of skeletal fragments
  • 18. Cryptocrystalline silica rock often mistaken for flint
  • 19. Green mineral indicating metamorphic transformation
  • 20. Volcanic glass often mistaken for dark onyx

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