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  1. Mineral of Indigo
  2. Water Washing Over Rocks
  3. Bolivia, Potosi, Amethyst in a Bolivian museum
  4. Mediterranean Agate II
  5. Glutamic acid crystals, light micrograph
  6. Desert Agate II
  7. Indigo Agate I
  8. Agate Studies III
  9. Oregon. Close-up of Graveyard Point Plume Agate stone
  10. Fortifications Agua Nueva Agate
  11. Stacked Agate II
  12. Phthalo Blue Agate I
  13. Shattuckite Jasper
  14. Cut and polished diamond
  15. Chrysocolla
  16. Cobalt Blue Agate II
  17. Stacked Agate I
  18. Autumn Agate II
  19. Pebbles in Blue
  20. Van Gogh from Space - USGS Earth as Art
  21. Purple Watercolor Agate II
  22. Mineral Spirit III
  23. Lapis Lazuli Agate I
  24. Blue Agate
  25. Limoncello Agate I
  26. Oregon, Owyhee River Valley. Close-up of Morrisonite Jasper
  27. Grey Agate IV
  28. Ocean Jasper
  29. Alaska, Lichen covers rocks near Polychrome Pass in Denali National Park, Alaska
  30. Gem Stones III
  31. Moss Agate
  32. Rainbow Ridge Picture Agate
  33. Plum Agate I
  34. Malachite
  35. No Man's Land - USGS Earth as Art
  36. Mineral Spirit I
  37. View of rocks in water
  38. Indigo Agate C
  39. Rock pebbles
  40. Pebbles I
  41. Pietersite
  42. Amethyst crystals
  43. Agate Studies IV
  44. Patterns created by sea erosion on rocks, Northumberland England, UK
  45. Desert Agate I
  46. Purple Watercolor Agate I
  47. Petrified Wood close-up
  48. Gamboge Agate I