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  1. Water Washing Over Rocks
  2. Grey Agate E
  3. Oregon. Close-up of Graveyard Point Plume Agate stone
  4. Blue Agate
  5. Indigo Agate I
  6. Mediterranean Agate II
  7. Fortifications Agua Nueva Agate
  8. Glutamic acid crystals, light micrograph
  9. Grey Agate B
  10. Mineral of Indigo
  11. Stacked Agate II
  12. Pebbles in Blue
  13. Van Gogh from Space - USGS Earth as Art
  14. Crystalline Serpent I
  15. No Man's Land - USGS Earth as Art
  16. Amethyst crystals
  17. Oregon, Owyhee River Valley. Close-up of Morrisonite Jasper
  18. Bolivia, Potosi, Amethyst in a Bolivian museum
  19. Indigo Agate C
  20. Blue Watercolor Agate Rectangle
  21. Gamboge Agate I
  22. Agate 9
  23. Malachite
  24. Stacked Agate I
  25. Chrysocolla
  26. Shattuckite Jasper
  27. Ocean Jasper
  28. Phthalo Blue Agate I
  29. Gem Stones III
  30. Prism Agate II
  31. Andes - USGS Earth as Art
  32. mineral
  33. Grey Agate VI
  34. Gem Stones I
  35. Arkansas - USGS State Mosaic
  36. Rainbow Ridge Picture Agate
  37. Desert Agate I
  38. Mississippi River Delta - USGS Earth as Art
  39. View of rocks in water
  40. Malachite
  41. Limoncello Agate I
  42. Always and Forever - Sentiment
  43. Agate Studies IV
  44. Poppy Jasper
  45. Mineral Spirit III
  46. Purple Watercolor Agate II
  47. Iron pyrites
  48. Alaska, Lichen covers rocks near Polychrome Pass in Denali National Park, Alaska