Table 2 Average chemical composition of talc from Alagua (sample 3a: 3 analyses; sample 3b: 4 analyses and sample 14: 4 analyses

SiO₂

61.83

62.86

63.25

62.8

63.37

Al₂O₃

0.18

0.19

0.33

0.27

0.31

FeO

4.5

3.52

4.42

3.74

3.24

MgO

28.37

29.03

28.6

28.21

29.26

F

0.34

0.36

0.37

nd

nd

Total

95.22

95.97

96.98

95.01

96.17

Si

7.974

8.000

7.997

8056

8012

Al

0.027

0.029

0.049

0.041

0.046

Fe²⁺

0.486

0.375

0.468

0.401

0.342

Mg

5.456

5.509

5.391

5.395

5.516

F

0.137

0.145

0.149

nd

nd