Table 5 Major and minor element composition of Ti-chondrodite and Ti-clinohumite

SiO₂

32.95

33.14

33.66

33.68

37.48

37.26

37.76

37.39

37.26

37.48

38.53

37.27

37.85

TiO₂

8.35

9.14

7.61

8.71

3.37

3.72

3.16

2.13

4.88

3.37

2.50

2.98

3.77

Al₂O₃

b.d.

0.03

0.01

0.01

b.d.

0.02

b.d.

0.01

0.14

b.d.

0.01

0.03

0.01

Cr₂O₃

0.01

0.02

0.01

b.d.

b.d.

b.d.

0.01

0.03

0.01

b.d.

0.01

b.d.

0.01

FeO

7.08

6.23

5.42

3.38

4.81

3.42

3.12

5.35

2.41

4.81

2.40

5.57

4.71

MnO

0.57

0.42

0.42

0.32

0.25

0.39

0.25

0.30

0.28

0.25

0.24

0.32

0.37

NiO

0.09

0.05

0.08

0.09

0.11

0.13

0.14

0.13

0.12

0.11

0.11

0.12

0.11

MgO

47.55

47.29

50.04

50.22

52.37

52.56

53.62

52.44

52.32

52.37

54.25

51.20

52.02

CaO

0.01

0.01

0.03

0.02

b.d.

b.d.

b.d.

b.d.

0.02

b.d.

b.d.

b.d.

0.02

H₂O¹

3.13

2.92

3.40

3.11

2.07

1.98

2.13

2.34

1.70

2.07

2.27

2.11

1.97

Total

99.74

99.25

100.72

99.53

100.46

99.49

100.19

100.16

99.14

100.46

100.33

99.65

100.86

Si

1.978

1.997

1.979

1.993

3.981

3.979

3.991

3.981

3.988

3.981

4.053

4.005

4.013

Ti

0.377

0.414

0.336

0.388

0.269

0.299

0.251

0.171

0.393

0.269

0.198

0.241

0.301

Al

–

0.002

0.001

< 0.001

–

0.003

–

0.002

0.017

–

0.002

0.003

0.001

Cr

0.001

0.001

< 0.001

–

–

–

0.001

0.003

0.001

–

0.001

–

0.001

Fe⁺²

0.355

0.314

0.267

0.167

0.427

0.305

0.276

0.476

0.216

0.427

0.211

0.501

0.418

Mn

0.029

0.022

0.021

0.016

0.022

0.035

0.022

0.027

0.026

0.022

0.022

0.029

0.034

Ni

0.004

0.003

0.004

0.004

0.010

0.012

0.012

0.011

0.010

0.010

0.009

0.010

0.009

Mg

4.255

4.247

4.386

4.430

8.291

8.367

8.447

8.323

8.348

8.291

8.506

8.201

8.221

Ca

< 0.001

0.001

0.002

0.001

–

–

–

–

0.002

–

–

–

0.003

H

1.255

1.173

1.334

1.228

1.466

1.407

1.500

1.662

1.217

1.466

1.593

1.515

1.396

Mg#

91.6

92.6

93.8

95.9

94.8

96.0

96.5

94.2

97.1

94.8

97.2

93.8

94.7