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Table 1 Titanian clinohumite from Cerro del Almirez, Spain (Al) and Cima di Gagnone, Switzerland (MG)

From: FTIR and Raman spectroscopy characterization of fluorine-bearing titanian clinohumite in antigorite serpentinite and chlorite harzburgite

  Sample: rock type
Al96-20: Ant serp Al96-15B: TiCl vein Serp Al96-10: Px lamella Al96-1C: Chl harz Al01-7B: En vein Al98-29A: Marble MG-304B: Chl perid
SiO2 35.8 (9) 36.4 (5) 36.8 (1) 36.2 (2) 36.9 (4) 36.8 (4) 36.2 (4)
TiO2 5.4 (1) 5.3 (2) 5.6 (2) 4.9 (1) 4.8 (1) 2.4 (1.1) 1.9 (6)
FeO 7.1 (2) 8.7 (5) 8.1 (6) 8.3 (1) 8.9 (2) 9.1 (8) 8.4 (3)
MnO 0.36 (4) 0.32 (3) 0.39 (3) 0.13 (2) 0.10 (5) 0.10 (3) 0.08 (4)
MgO 47.8 (1.2) 47.3 (5) 47.6 (4) 47.7 (2) 48.1 (3) 49.4 (1.0) 49.8 (4)
NiO 0.14 (3) 0.16 (1) 0.15 (2) 0.25 (1) 0.19 (1) 0.19 (1) 0.14 (2)
F 0.02 (2)c 0.02 (2)c 0.014 (4)d 0.49 (5) 0.62 (4) 1.58 (50) 1.78 (21)
H2Oa 2.71 (26) 2.73 (2) 2.74 (2) 2.50 (2) 2.47 (3) 2.02 (23) 1.91 (10)
Total 99.6 (8) 101.0 (5) 101.5 (3) 100.8 (4) 102.1 (6) 101.6 (3) 100.4 (5)
n 4 16 5 5 4 8 5
Ti 0.45 (19) 0.43 (2) 0.46 (1) 0.41 (1) 0.39 (1) 0.20 (9) 0.16 (5)
Fe 0.66 (7) 0.80 (4) 0.74 (6) 0.76 (1) 0.81 (1) 0.82 (7) 0.76 (3)
Mn 0.03 (2) 0.03 (0) 0.04 (0) 0.01 (0) 0.01 (0) 0.01 (0) 0.01 (0)
Mg 7.87 (64) 7.73 (6) 7.74 (5) 7.80 (1) 7.77 (1) 7.97 (12) 8.10 (5)
Ni 0.01 (2) 0.01 (0) 0.01 (0) 0.02 (0) 0.02 (0) 0.02 (0) 0.01 (0)
F 0.005 (10) 0.006 (10) 0.009 (10) 0.17 (2) 0.21 (1) 0.54 (17) 0.61 (7)
OHb 1.10 (32) 1.12 (3) 1.07 (3) 1.02 (3) 1.01 (2) 1.07 (5) 1.08 (3)
  1. TiCl compositions are an average of several electron probe analyses on a rock sample shown as weight percent, and the number of points used for the average is indicated as ‘n.’ Large standard deviations of the average represent the extent of sample heterogeneity, as indicated by italics. Numbers in parentheses indicate the uncertainty expressed as the last digits of reported values, as in ‘1.07 (5)’ corresponds to 1.07 ± 0.05. aH2O weight percent was calculated from the stoichiometric balance of OH. bOH was calculated from the stoichiometric balance. cThree low F abundance measurements were below the detection limit and the relative standard deviations were more than 100%; hence, these values should be considered as maximum possible values. dThe value verified by a secondary ion mass spectrometer.