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