Table 1 Average composition of Ca-phosphates (wt%).

From: Hydrogen-bearing vesicles in space weathered lunar calcium-phosphates

 

Apatite

Merrillite

SiO2

2.54

0.70

Al2O3

0.56

0.42

MgO

0.20

3.40

CaO

53.27

46.85

FeO

0.66

0.86

Na2O

0.02

0.22

P2O5

36.47

40.96

Y2O3

1.35

1.88

La2O3

0.15

0.46

Ce2O3

0.55

2.33

Nd2O3

0.60

1.45

Cl

0.18

0.35

F

2.28

0.13

H2Oa

1.16

0.00

  1. aCalculated (F+Cl+OH):Ca is 1:5; oxides renormalized.
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