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  1. Petrified Wood close-up
  2. Earth Agate IV
  3. Gem Stones IV
  4. Outback Abstract
  5. Agate Sample
  6. Quartz crystals
  7. Agate Geode I Plum
  8. Kentucky - USGS State Mosaic
  9. California - USGS State Mosaic
  10. Gold Leaf Agate
  11. Jewels
  12. Woman holding amethyst
  13. Giant's Causeway, County Antrim, Ireland
  14. Amethyst
  15. Mineral Spirit VI
  16. Close-up of smooth stone textured surface
  17. Stratified rock at Agio Pavlos, island of Crete, Greece, Mediterranean
  18. Sanduba marble
  19. Strata In Rock Formation Along Verzasca River
  20. Purple I
  21. Oregon. Close-up of Owyhee Picture Jasper stone
  22. Bismuth crystal
  23. Ammonite
  24. Oklahoma - USGS State Mosaic
  25. Silver Lace Onyx
  26. Grey Agate I
  27. Kansas - USGS State Mosaic
  28. Native copper
  29. Meandering Mississippi - USGS Earth as Art
  30. Purple II
  31. Piute jasper
  32. Granite II
  33. Water Color Agate Square II
  34. Florida - USGS State Mosaic
  35. Cerulean Blue Agate II
  36. Purple Jasper
  37. Marble
  38. Strata In Rock Formation Along Verzasca River
  39. Volcanic ash layers in rock
  40. Tiger Iron II
  41. Montana - USGS State Mosaic
  42. Arizona, close-up of petrified wood
  43. Peridot
  44. Crystalline Serpent I
  45. Ocean Jasper from Madagascar
  46. Agate Geode II Plum
  47. Mississippi River Delta - USGS Earth as Art
  48. Molecular model of quartz