Sand # 7: Olivine Sand from Green Sand Beach, Hawaii http://faculty.pasadena.edu

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Sand # 7: Olivine Sand from Green Sand Beach, Hawaii

http://faculty.pasadena.edu/dndouglass/sand/SandPile/GrnSand.htm

Sand # 6 and Sand # 7 are green sand, composed almost entirely of the mineral olivine.

14- Zoom in on each of the olivine sands. Using the sandstone roundness guides (Figure 3.9), describe the roundness of each of the sands. Are they well- rounded, rounded, sub rounded, subangular, or angular?

Sand Specimen

Roundness description

Toilet Bowl, Oahu, Hawaii

Green Sand Beach, Hawaii

15. Where do you think the olivine comes from? Why? Explain your reasoning.

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16. Which of the two sands has the larger grains?

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17. From your observation of grain size, predict which beach has the higher wave energy

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18. How does grain size relate to roundness? Are the larger grains rounder or less rounded?

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Sand # 8: Oolitic Sand from the Great Salt Lake,

http://faculty.pasadena.edu/dndouglass/sand/SandPile/SltLake.htm

This is a lake sediment. Sand like this is also found in warm shallow seas in tropical regions. Look at this sand carefully under high magnification. These grains are called oolites (or ooids), and they are composed entirely of calcium carbonate.

19. Using the sandstone roundness guides (Figure 3.9), describe the roundness of the sand. Is it well-rounded, rounded, sub-rounded, subangular, or angular?

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20. Using the sandstone sorting guide (Figure 3.8), describe the sorting of this sand. Is it very well-sorted, well-sorted, moderately well-sorted, poorly sorted, or poorly sorted?

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21. Interpret the energy level of the depositional environment of this sand.

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Sand # 9: Eolian Sands from Al Wasrah, Kuwait.

http://faculty.pasadena.edu/dndouglass/sand/SandPile/AlWasra.htm

Eolian sands differ from other types of sands in that they have been deposited by the action of wind.

23. Using the sandstone roundness guides (Figure 3.9), describe the roundness of the sand. Is it well-rounded, rounded, sub-rounded, subangular, or angular?

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24. Using the sandstone sorting guide (Figure 3.8), describe the sorting of this sand. Is it very well-sorted, well-sorted, moderately well-sorted, poorly sorted, or very poorly sorted?

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25.Compare the eolian sand with the beach sands. List three differences.

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Sand Specimen

Roundness description

Toilet Bowl, Oahu, Hawaii

Green Sand Beach, Hawaii

Explanation / Answer

Answer

(14). Angularity -

Sub rounded grains of green sand beach of Hawaii.

Sub angular grain of Toilet Hawaii.

(15) Olivine comes from altramafic rocks because of olivine have some ability to resist against weathering.

(16) Green sand beach Hawaii have larger grains.

(17) Toilet Bowl, Oahu, Hawaii have larger grains size.

(18) sediment showing considerable distance showing high degree of rounding larger grain is less rounded.

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