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Table 2 Illite Kübler index (KI) and chlorite “crystallinity” (ChC) values of the <2 μm grain-size fraction samples (data in Δ°2θ) and b cell dimension data of illite-muscovite (whole-rock samples)

From: Retrograde alterations of phyllosilicates in low-grade metapelite: a case study from the Szendrő Paleozoic, NE-Hungary

Sample

Illite Kübler index (KI) and chlorite “crystallinity” [ChC(001) and ChC(002)] values

Ill-Ms b cell

Air-dried (AD)

Ethylene glycol-solvated (EG)

dimension (Å) (whole-rocks)

Ill-Ms 10 Å

Chl 14 Å

Chl 7 Å

Ill-Ms 10 Å

Chl 14 Å

Chl 7 Å

FWHM

KI

FWHM

ChC(001)

FWHM

ChC(002)

FWHM

KI

FWHM

ChC(001)

FWHM

ChC(002)

Gn-1

4.1m

0.23

0.24

0.21

0.22

8.989

Gn-1

7.6m

0.22

0.24

0.24

0.25

8.987

Gn-1

10.6m

0.22

0.23

0.20

0.22

8.981

Gn-1

13.0m

0.21

0.22

0.21

0.22

Gn-1

34.0m

0.21

0.23

0.21

0.22

8.986

Gn-1

38.3m

0.22

0.24

0.22

0.24

8.987

Gn-1

52.0m

0.20

0.21

0.28

0.29

0.20

0.22

0.30

0.31

8.989

Gn-1

60.0m/b

0.19

0.20

0.19

0.21

0.19

0.21

0.19

0.21

0.20

0.21

0.18

0.19

Gn-1

75.0m

0.20

0.21

0.26

0.27

0.20

0.22

0.24

0.26

8.992

Gn-1

89.0m/a

0.21

0.23

0.23

0.24

0.21

0.22

0.20

0.22

0.21

0.23

0.20

0.22

Gn-1

89.0m/b

0.20

0.22

0.20

0.22

0.20

0.21

0.21

0.22

  1. FWHM: as measured full width at half maximum height of the basal reflection; with italic: FWHM and KI values of samples that contain Pg in subordinate quantities to Ill-Ms. Equation used for calibration: KI or ChC = 0.9430 × FWHM + 0.0269 (r = 0.9998) for further details of the calibration see Kisch et al. (2004)