Site

P₂O₅

SiO₂

Al₂O₃

Fe₂O₃

CaO

MgO

Na₂O

K₂O

El-Hamrawein

28

14.5

0.74

4.2

45

0.9

0.8

0.9

El-Quseir

30

15.3

0.52

3.1

47

1.1

0.6

1.3

Safaga

33

11.2

0.33

2.3

41

0.8

1.1

1.2