Sph = Sphalerite
Mag = Magnetite
Hem = Hematite
Gal = Galena
Chal = Chalcopyrite
Mar = Marcassite
Pyr = Pyrite
Sku = Skutterudite
Iron = Kamacite
The photometer can be used to calibrate the reflection coefficients of minerals. I have prepared sections of known minerals to produce the calibration curves below. Of course a better result could be obtained with reflection standards but for the purpose of the minerals identification and to reduce the cost I have chosen this method. Narrow wavelength range interference filters could be positioned into the light path to measure the reflection at different wavelengths. For a quick identification, I recalibrate with 2 points (Chromite and Skutterudite) at 540 nm so I can get a better idea of the reflecting power of unknown minerals than simple examination can provide.
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Chr = Chromite
Sph = Sphalerite Mag = Magnetite Hem = Hematite Gal = Galena Chal = Chalcopyrite Mar = Marcassite Pyr = Pyrite Sku = Skutterudite Iron = Kamacite |
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Bireflectant minerals have 2 values in the calibration. For best results, only isotropic materials should be used for calibration. |
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