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Means (s.d.) of nanoindentation hardness values for potential wear agents. n is the number of samples, mean the s.d. All tests used a Berkovich diamond tip.
| property | phytoliths |
quartz dust (n = 117) | enamel (n = 100) | |
|---|---|---|---|---|
| squash (n = 14) | grass (n = 17) | |||
| indentation hardness (GPa) | 0.89 (0.48) | 2.56 (0.81) | 12.8 (1.07) | 5.0 (0.28) |
| data range | 0.43–1.74 | 1.35–4.24 | 10.1–14.1 | 4.08–5.72 |
