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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