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Table 3 Representative chemical compositions of olivine and pyroxenes in the four Itokawa particles

From: Mineralogy of four Itokawa particles collected from the first touchdown site

  Sample
  RB-QD04-0008 RB-QD04-0008 RB-QD04-0011 RB-QD04-0015 RB-QD04-0024
  Mineral
  Olivine High-Ca pyroxene Olivine Olivine Low-Ca pyroxene
SiO2 37.64 52.00 36.91 37.33 54.87
TiO2 b. d. 0.42 b. d. b. d. 0.05
Al2O3 b. d. 0.45 b. d. b. d. 0.08
Cr2O3 b. d. 0.77 b. d. b. d. 0.15
FeO 27.07 7.49 26.18 27.14 15.19
MnO 0.50 0.21 0.43 0.42 0.40
MgO 34.12 16.13 35.30 34.65 27.23
CaO b. d. 20.41 b. d. b. d. 1.11
Na2O b. d. 0.43 b. d. b. d. b. d.
K2O b. d. b. d. b. d. b. d. b. d.
Total wt.% 99.33 98.31 98.82 99.54 99.08
Mol% end members Fo69.2 Wo41.9En46.1 Fo70.6 Fo69.5 Wo2.2En74.5
  1. Fo, forsterite; Wo, wollastonite; En, enstatite; b. d., below detection limit.