Element or mineral^a

Average

Standard deviation

Minimum

Maximum

FeT

30.0

2.97

12.5

41.7

SiO₂

57.1

5.53

36.0

90.6

Amphiboles

1.908

2.39

0.00

17.6

Apatite

0.12

0.06

0.00

0.61

Carbonates

0.87

1.14

0.00

9.52

Hematite Goethite

39.2

5.24

16.6

63.2

Magnetite

3.34

2.69

0.00

26.7

Mica

0.59

0.72

0.003

16.6

Manganese oxides

0.097

0.078

0.00

1.03

Plagioclases

0.62

0.59

0.001

8.33

Pyrite

0.009

0.024

0.001

0.58

Quartz

53.2

4.33

35.3

71.1

Titaniferous minerals

0.067

0.15

0.00

2.58