Rock on

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Across
  1. 4. finely felsic
  2. 7. pyroxene-bearing granitoid
  3. 8. cool under pressure
  4. 9. extinct chemical sediment, indicative of an anoxic ocean
  5. 11. incredible, edible rock
  6. 12. upper crust, in the ocean at least
  7. 13. you can wipe it clean
  8. 17. muddied waters might drop this signature
  9. 18. evaporite with a soft touch
  10. 20. its main mineral name derives from an Italian range
  11. 21. main constituent of the lunar highlands
  12. 23. shelly sand
  13. 27. recrystallized beach or dune
  14. 30. mafic + named for a U.S. state
  15. 32. meteoritic jewelry
  16. 34. lithified cosmic dust
  17. 35. named for a prominent mountain range
  18. 36. a granite sans K-spar
  19. 39. a swamp's deepest aspiration?
  20. 40. on a lithofacies map, you'll find it between "fss" and "sh"
  21. 43. turbid clay/sand mix
  22. 46. widespread fossil fuel
  23. 47. fine lime, as from Solnhofen
  24. 49. nature's pottery
  25. 50. dry or rapidly-quenched, it's glass
  26. 51. odd lava erupted from Ol Doinyo Lengai
  27. 52. named by Charles Lapworth for exposures near Loch Eriboll, Scotland
  28. 53. might be mistaken for salt & pepper
  29. 54. Pele's meringue
  30. 55. sitting on its ash
  31. 56. petrified beach or dune
  32. 58. roe, roe, roe beneath your boat?
  33. 60. some of its crystals can reach the size of a house
  34. 61. flakey and scaly
  35. 62. rounded gravel that has finally stopped tumbling
Down
  1. 1. "zebra" stripes that indicate orogeny shearing a plutonic protolith
  2. 2. named for a town in ZA
  3. 3. a granite sans quartz
  4. 5. brown, low-grade successor to peat
  5. 6. sub-Moho greenery
  6. 10. Europeans call it dolerite
  7. 14. fine-grained late-stage intrusion in many batholiths
  8. 15. dark and conchoidal, good for axes
  9. 16. hot stuff for a young planet
  10. 19. most continental crust is taken for it
  11. 22. hot, wet, sheared mantle (the south tower of the Golden Gate Bridge is "anchored" in it)
  12. 24. coccoliths suitable for scrawling
  13. 25. dense enough to drive delamination?
  14. 26. smashed shells
  15. 28. makes up the highest-elevation outcrop on this planet
  16. 29. silica so fine
  17. 31. a seafloor sediment to make garden pests shudder
  18. 32. a "fossil earthquake"
  19. 33. shards fused not far from home
  20. 35. felsic + named for a U.S. state
  21. 37. red and bubbly, a favorite for landscapers
  22. 38. so welded, it bears a glassy texture
  23. 41. red cryptocrystalline silica
  24. 42. sugary and fizzy, but not a soda pop
  25. 44. signature of old ice
  26. 45. popular belts during the Archaean
  27. 48. sediment with a rifty flavor
  28. 52. source from which granite flows
  29. 54. "zebra" stripes that indicate orogeny shearing a sedimentary protolith
  30. 57. banded and spongey, freshwater derived
  31. 59. makes up the Vietnam Veteran's Memorial, despite what the Park Service will tell you