Absolute Calibrations with Hydrogen Manometry

 Potassium Feldspar     Pyrope Garnet     Orthopyroxene     Clinopyroxene

Feldspar

 
 
orthoclase
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

 
 
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.
 
calibration line
The quality of the calibration is shown in the graph to the left.  The value for 0 sample mass is the procedure blank.
 
 

reference:  Bell DR, Ihinger PD, Rossman GR (1995) Quantitative analysis of hydroxyl in garnet and pyroxene. American Mineralogist 80, 465-474.

Orthopyroxene

enstatite
  
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.
 
augite
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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