N

2-theta

d, Å

Minerals

Chemical formula and amount of minerals

Crystal symmetry, space group and lattice parameters (Å)

1

20.83

4.25

SiO₂

2

26.19

3.34

Quartz

SiO₂

Hexagonal, P3₂2₁, a = 4.91, c = 5.40

3

27.50

3.23

Na[AlSi₃O₈]

4

27.87

3.19

Albite

Na[AlSi₃O₈] (27.55%)

5

29.44

3.03

Anorthite

Ca(Al₂Si₂O₈)

(9.21%)

Monoclinic, I(−1), a = 8.18, b = 12.86, c = 14.16

6

33.12

2.70

Hematite

α-Fe₂O₃

(8.49%)

Rhombohedral, R(−3)c, a = 5.03, c = 13.74

7

35.48

2.52

α-Fe₂O₃

8

36.38

2.45

SiO₂

9

39.37

2.28

SiO₂

10

42.36

2.12

SiO₂

11

50.00

1.81

SiO₂

12

50.69

1.79

SiO₂

13

59.86

1.54

SiO₂

14

67.44

1.36

SiO₂