Sanidine gives a defined spectra, however NH4-feldspar (Buddingtonite) doesn't show a proper signal. Shouldn't both minerals have similar vibrations in the silicate lattice?
perhaps due to colored impurities and wrong laser excitation wavelength..
It depends what you mean by "doesn't show a proper signal"!
As above, impurites can give rise to a fluorescent background, or even without them, as very fine powder can give rise to a broad scattering background.
In the former case, changing laser line could help.
In the latter, making a compressed pellet of the material on its own, or mixed with KBr could help (as used for FTIR)
In the data from John, both are spectra are dominated by background, which could be scattering, or fluorescence from impurities. Scattering depends on morphology, so compacting in a pellet or in a matrix such as KBr can help.
Ultimately, a comparison of single crystal spectra would be helpful...
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