Table 3 Average pyroxene compositions in lunar meteorite Northwest Africa (NWA) 2977 polished thin section (PTS) 01-1 (this work), in comparison with the compositional ranges of Zhang et al. (2011)

Oxide (wt%)

SiO₂

53.91(0.64)

52.12(0.56)

53.88(0.21)

51.92(0.47)

53.7–54.2

51.5–52.4

54.2

TiO₂

0.33(0.20)

0.94(0.45)

0.48(0.10)

0.72(0.13)

0.17–0.56

0.24–1.68

0.60

Al₂O₃

1.15(0.19)

2.15(0.14)

1.20(0.15)

2.03(0.42)

0.83–1.55

2.07–2.28

0.74

Cr₂O₃

0.51(0.11)

0.85(0.06)

0.42(0.09)

0.70(0.07)

0.19–0.73

0.37–1.01

0.30

FeO

14.47(1.24)

9.05(0.60)

16.04(0.46)

8.85(0.63)

13.9–16.7

9.21–9.26

17.9

MnO

0.29(0.08)

0.22(0.03)

0.31(0.09)

0.23(0.06)

0.28–0.32

0.18–0.22

0.29

MgO

23.29(1.39)

16.96(0.64)

24.06(0.38)

15.85(0.51)

20.6–24.3

15.1–18.5

24.0

CaO

4.89(1.12)

16.56(0.63)

2.14(0.08)

17.51(1.07)

3.37–8.10

16.3–18.9

2.09

Na₂O

b.d.

0.07(0.01)

b.d.

0.09(0.02)

b.d.

<0.06

b.d.

K₂O

b.d.

b.d.

b.d.

b.d.

P₂O₅

0.04(0.01)

0.13(0.01)

b.d.

0.14(0.03)

Total

98.88

99.05

98.53

98.04

100.1

Mg#

74

77

73

76

71–76

75–78

71

Wo

10.3

36.8

4.5

39.3

7.0–16.8

33.1–40.0

4.2

En

66.9

49.7

70.0

47.0

59.8–67.2

44.7–52.4

67.7

Fs

22.8

13.5

25.5

13.7

21.3–27.0

14.5–15.2

28.0