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Table 2 Average mineral compositions of four newly analyzed particles

From: Mineralogy and crystallography of some Itokawa particles returned by the Hayabusa asteroidal sample return mission

 

RA-QD02-100

RA-QD02-133-1

RA-QD02-138

RA-QD02-179

 

Plagioclase

Olivine

Plagioclase

Olivine

Olivine

SiO2

63.7

37.0

64.1

37.5

39.6

Al2O3

21.7

0.03

21.8

b.d.

0.05

TiO2

b.d.

b.d.

b.d.

b.d.

b.d.

FeO

0.09

26.3

0.11

26.6

23.5

MnO

b.d.

0.41

b.d.

0.43

0.40

MgO

0.05

34.7

b.d.

34.5

36.5

CaO

2.25

b.d.

2.25

b.d.

b.d.

Na2O

8.75

0.03

8.92

0.04

b.d.

K2O

0.78

b.d.

0.99

b.d.

b.d.

Cr2O3

b.d.

b.d.

b.d.

b.d.

b.d.

NiO

b.d.

b.d.

b.d.

b.d.

b.d.

P2O5

b.d.

 

b.d.

b.d.

b.d.

Total

97.3

98.5

98.2

99.1

100.1

Fo

 

70.2

 

69.8

73.4

Fa

 

29.8

 

30.1

26.6

An

11.9

 

11.5

  

Ab

83.2

 

82.4

  

Or

4.9

 

6.1

  
  1. b.d., below detection.