Absolute Calibrations with Hydrogen Manometry
Potassium Feldspar
Pyrope Garnet Orthopyroxene
Clinopyroxene
Feldspar
The spectrum or microcline from the White Queen Mine, Pala, California,
containing 0.14 wt % H2O.
reference: Hofmeister AM, Rossman GR (1985) A spectroscopic
study of amazonite: irradiative coloration of structurally hydrous Pb-bearing
feldspar. American Mineralogist 70, 794-804.
Pyrope
The spectrum of pyrope MON-9 from the Monastery Mine, South Africa, containing
56 ppm H2O. The species in the mineral is actually
OH, but the analyses, by convention, are expressed as H2O. On
the left is the actual megacryst used for the analysis. On the right
is the amount of flawless, gem-quality material separated from the megacryst
which was used for the hydrogen manometry analyses.
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The quality of the calibration is shown in the graph to the left.
The value for 0 sample mass is the procedure blank.
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reference: Bell DR, Ihinger PD, Rossman GR (1995) Quantitative
analysis of hydroxyl in garnet and pyroxene. American Mineralogist 80,
465-474.
Orthopyroxene
The spectrum of enstatite KBH-1 from a spinel lherzolite from Kilbourne
Hole, New Mexico containing 186 ppm H2O. These spectra
require baseline correction with a dry reference sample of about the same
composition. The baseline complexity comes, in part, from Fe2+
ligand-field electronic absorption centered near 2400 cm-1.
reference: Bell DR, Ihinger PD, Rossman GR (1995) Quantitative
analysis of hydroxyl in garnet and pyroxene. American Mineralogist 80,
465-474.
Clinopyroxene
The spectrum of a 1.00 mm thick augite megacryst PMR-53 from the Premier
Mine, South Africa, and the manometry calibration curve showing that it
contains 268 ppm H2O.
reference: Bell DR, Ihinger PD, Rossman GR (1995) Quantitative
analysis of hydroxyl in garnet and pyroxene. American Mineralogist 80,
465-474.
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