Table 1 Major and minor element compositions of adhering and host grains (oxide wt.%) obtained by energy dispersive X-ray spectroscopy (EDS)
From: Adhering grains and surface features on two Itokawa particles
Adhering grains | Host grains | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Chromite Fig. 4a | Si-rich material Fig. 4a | Adhering olivine Fig. 4e | Top of the fluffy grain Fig. 4e | Bottom of the fluffy grain Fig. 4e | Phosphate Fig. 4d | Adhering grain Fig. 4f | Fig. 4a | Fig. 4b | Fig. 4c | Fig. 4d | Fig. 4e | Fig. 4f | |
SiO2 | 0.0 | 60.0 | 39.2 | 96.2 | 40.7 | 0.0 | 65.2 | 40.7 | 38.4 | 76.2 | 67.9 | 40.9 | 64.3 |
Al2O3 | 8.5 | 17.4 | 0.0 | 0.0 | 0.0 | 0.0 | 22.9 | 0.0 | 0.0 | 22.3 | 23.1 | 0.0 | 22.1 |
Cr2O3 | 60.6 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
FeO | 31.0 | 9.4 | 19.3 | 3.8 | 24.3 | 0.0 | 0.0 | 21.2 | 24.6 | 0.0 | 0.0 | 21.7 | 0.0 |
MgO | 0.0 | 11.9 | 41.5 | 0.0 | 35.0 | 0.0 | 0.0 | 38.1 | 37.0 | 0.0 | 0.0 | 37.3 | 0.0 |
CaO | 0.0 | 1.2 | 0.0 | 0.0 | 0.0 | 51.5 | 2.2 | 0.0 | 0.0 | 0.0 | 2.2 | 0.0 | 2.2 |
Na2O | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 6.1 | 0.0 | 0.0 | 1.5 | 6.2 | 0.0 | 10.5 |
K2O | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 3.6 | 0.0 | 0.0 | 0.0 | 0.6 | 0.0 | 0.9 |
P2O5 | 48.5 | 0.0 | 0.0 | ||||||||||
Total | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
Structural formulae | |||||||||||||
Si | 0.0 | 1.0 | 0.0 | 11.5 | 1.0 | 1.0 | 11.7 | 1.1 | 11.4 | ||||
Al | 2.8 | 0.0 | 0.0 | 4.8 | 0.0 | 0.0 | 4.7 | 0.0 | 4.6 | ||||
Cr | 13.6 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | ||||
Fe | 7.4 | 0.4 | 0.0 | 0.0 | 0.5 | 0.5 | 0.0 | 0.5 | 0.0 | ||||
Mg | 0.0 | 1.6 | 0.0 | 0.0 | 1.5 | 1.5 | 0.0 | 1.4 | 0.0 | ||||
Ca | 0.0 | 0.0 | 19.6 | 0.4 | 0.0 | 0.0 | 0.4 | 0.0 | 0.4 | ||||
Na | 0.0 | 0.0 | 0.0 | 2.1 | 0.0 | 0.0 | 2.1 | 0.0 | 3.6 | ||||
K | 0.0 | 0.0 | 0.0 | 0.8 | 0.0 | 0.0 | 0.1 | 0.0 | 0.2 | ||||
P | 0.0 | 0.0 | 14.6 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | ||||