1. Skip to navigation
  2. Skip to content
  3. Skip to sidebar


Callan Bentley's Snapshots

Go to page:
  1. Garnet

    Snapshot Title: Garnet
    Taken by: Callan Bentley

    Image: Garent-bearing anorthosite
    Image Owner: Callan Bentley



    Description:

    Along boundary between other two minerals.



  2. Augite

    Snapshot Title: Augite
    Taken by: Callan Bentley

    Image: Garent-bearing anorthosite
    Image Owner: Callan Bentley



    Description:

    pyroxene



  3. Plagioclase

    Snapshot Title: Plagioclase
    Taken by: Callan Bentley

    Image: Garent-bearing anorthosite
    Image Owner: Callan Bentley



    Description:

    feldspar



  4. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Garent-bearing anorthosite
    Image Owner: Callan Bentley



    Description:

    1 cm black bar.



  5. Animal analogy?

    Snapshot Title: Animal analogy?
    Taken by: Callan Bentley

    Image: Felsic spherulite from Shetland
    Image Owner: Callan Bentley



    Description:

    Is it more like a hedgehog, an echidna, or a porcupine?



  6. Radial crystals

    Snapshot Title: Radial crystals
    Taken by: Callan Bentley

    Image: Felsic spherulite from Shetland
    Image Owner: Callan Bentley



    Description:

    in a spherulite



  7. Spherule structure

    Snapshot Title: Spherule structure
    Taken by: Callan Bentley

    Image: Felsic spherulite from Shetland
    Image Owner: Callan Bentley



    Description:

    These spherules are primary igneous textural elements in this felsic rock. They consist of radial "hedgehogs" of crystals clustered around a common point of nucleation.



  8. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Felsic spherulite from Shetland
    Image Owner: Callan Bentley



    Description:

    This is 1 cm wide.



  9. Stylolite

    Snapshot Title: Stylolite
    Taken by: Callan Bentley

    Image: Ulster White Limestone ("The Chalk") with belemnite fossil
    Image Owner: Callan Bentley



    Description:

    Pressure solution seam



  10. Radial calcite

    Snapshot Title: Radial calcite
    Taken by: Callan Bentley

    Image: Ulster White Limestone ("The Chalk") with belemnite fossil
    Image Owner: Callan Bentley



    Description:

    in the rostrum of the belemnite



  11. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Ulster White Limestone ("The Chalk") with belemnite fossil
    Image Owner: Callan Bentley



    Description:

    This is 1 cm wide.



  12. Stylolite

    Snapshot Title: Stylolite
    Taken by: Callan Bentley

    Image: Ulster White Limestone ("The Chalk") with belemnite fossil, Rathlin Island, Northern Ireland (U.K.)
    Image Owner: Callan Bentley



    Description:

    Pressure solution seam



  13. Scale
  14. Belemnite
  15. Coccolith

    Snapshot Title: Coccolith
    Taken by: Callan Bentley

    Image: Ulster White Limestone
    Image Owner: Robin Rohrback



    Description:

    Round plate from the exterior of a coccolithophore



  16. Coccolith

    Snapshot Title: Coccolith
    Taken by: Callan Bentley

    Image: Ulster White Limestone
    Image Owner: Robin Rohrback



    Description:

    Another armor plate from a coccolithophore



  17. Coccolith

    Snapshot Title: Coccolith
    Taken by: Callan Bentley

    Image: Ulster White Limestone
    Image Owner: Robin Rohrback



    Description:

    Round little doily



  18. Concentric layering

    Snapshot Title: Concentric layering
    Taken by: Callan Bentley

    Image: S3 spherulite layer in Mapete Formation, Fig Tree Group, Barberton Greenstone Belt
    Image Owner: Callan Bentley



    Description:

    Pretty clear in this example



  19. Concentric layering

    Snapshot Title: Concentric layering
    Taken by: Callan Bentley

    Image: S3 spherulite layer in Mapete Formation, Fig Tree Group, Barberton Greenstone Belt
    Image Owner: Callan Bentley



    Description:

    Seen in some spherules



  20. Spherules

    Snapshot Title: Spherules
    Taken by: Callan Bentley

    Image: S3 spherulite layer in Mapete Formation, Fig Tree Group, Barberton Greenstone Belt
    Image Owner: Callan Bentley



    Description:

    In cross section, 3D, and external molds (spherule-shaped hollows where they have popped out)



  21. Mud drape

    Snapshot Title: Mud drape
    Taken by: Callan Bentley

    Image: S3 spherulite layer in Mapete Formation, Fig Tree Group, Barberton Greenstone Belt
    Image Owner: Callan Bentley



    Description:

    between spherulite horizons



  22. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: S3 spherulite layer in Mapete Formation, Fig Tree Group, Barberton Greenstone Belt
    Image Owner: Callan Bentley



    Description:

    This black bar is 1 cm "tall"



  23. Spherules

    Snapshot Title: Spherules
    Taken by: Callan Bentley

    Image: S3 spherulite layer in the Mapepe Formation, Fig Tree Group
    Image Owner: Callan Bentley



    Description:

    in cross-section and 3D



  24. Spherules

    Snapshot Title: Spherules
    Taken by: Callan Bentley

    Image: S3 spherulite layer in the Mapepe Formation, Fig Tree Group
    Image Owner: Callan Bentley



    Description:

    Some 3D examples



  25. Mud drape

    Snapshot Title: Mud drape
    Taken by: Callan Bentley

    Image: S3 spherulite layer in the Mapepe Formation, Fig Tree Group
    Image Owner: Callan Bentley



    Description:

    Running through the center of the sample. Which way is "up?"



  26. Spherule

    Snapshot Title: Spherule
    Taken by: Callan Bentley

    Image: S3 spherulite layer in the Mapepe Formation, Fig Tree Group
    Image Owner: Callan Bentley



    Description:

    Clear concentric layering in this one.



  27. Spherule

    Snapshot Title: Spherule
    Taken by: Callan Bentley

    Image: S3 spherulite layer in the Mapepe Formation, Fig Tree Group
    Image Owner: Callan Bentley



    Description:

    Nice round one showing concentric structure.



  28. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: S3 spherulite layer in the Mapepe Formation, Fig Tree Group
    Image Owner: Callan Bentley



    Description:

    This is 1 cm.



  29. Exemplary spherules

    Snapshot Title: Exemplary spherules
    Taken by: Callan Bentley

    Image: S3 spherulite, Fig Tree Group, Barberton Greenstone Belt
    Image Owner: Callan Bentley



    Description:

    Interacting with mud drape



  30. Spherules

    Snapshot Title: Spherules
    Taken by: Callan Bentley

    Image: S3 spherulite, Fig Tree Group, Barberton Greenstone Belt
    Image Owner: Callan Bentley



    Description:

    Beautiful examples



  31. Concentrically zoned spherule

    Snapshot Title: Concentrically zoned spherule
    Taken by: Callan Bentley

    Image: S3 spherulite, Fig Tree Group, Barberton Greenstone Belt
    Image Owner: Callan Bentley



    Description:

    Partly broken out



  32. Concentric zoning and radial minerals

    Snapshot Title: Concentric zoning and radial minerals
    Taken by: Callan Bentley

    Image: S3 spherulite, Fig Tree Group, Barberton Greenstone Belt
    Image Owner: Callan Bentley



    Description:

    Inside a spherule



  33. Concentric zoning

    Snapshot Title: Concentric zoning
    Taken by: Callan Bentley

    Image: S3 spherulite, Fig Tree Group, Barberton Greenstone Belt
    Image Owner: Callan Bentley



    Description:

    Seen in weathered spherule



  34. Relatively unweathered spherules

    Snapshot Title: Relatively unweathered spherules
    Taken by: Callan Bentley

    Image: S3 spherulite, Fig Tree Group, Barberton Greenstone Belt
    Image Owner: Callan Bentley



    Description:

    In 3D (left two) and cross section (right one)



  35. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: S3 spherulite, Fig Tree Group, Barberton Greenstone Belt
    Image Owner: Callan Bentley



    Description:

    This is 1 cm tall.



  36. Spherule

    Snapshot Title: Spherule
    Taken by: Callan Bentley

    Image: S2 meteorite impact tsunami deposit, Barberton Greenstone Belt
    Image Owner: Callan Bentley



    Description:

    With concentric zoning.



  37. Spherule

    Snapshot Title: Spherule
    Taken by: Callan Bentley

    Image: S2 meteorite impact tsunami deposit, Barberton Greenstone Belt
    Image Owner: Callan Bentley



    Description:

    Showing concentric layering, as well as apparently a bit of faulting offsetting the top quarter relative to the bottom three quarters.



  38. Hole

    Snapshot Title: Hole
    Taken by: Callan Bentley

    Image: S2 meteorite impact tsunami deposit, Barberton Greenstone Belt
    Image Owner: Callan Bentley



    Description:

    Weathered out spherule, to judge by the shape of it.



  39. Spherules

    Snapshot Title: Spherules
    Taken by: Callan Bentley

    Image: S2 meteorite impact tsunami deposit, Barberton Greenstone Belt
    Image Owner: Callan Bentley



    Description:

    These round whitish to toothpaste-colored circles are cross-sections of spherules generated in the aftermath of the meteorite impact.



  40. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: S2 meteorite impact tsunami deposit, Barberton Greenstone Belt
    Image Owner: Callan Bentley



    Description:

    This is 1 cm long.



Go to page: