Pyrite spectra

Pyrite Near-Infrared Spectra (1000 - 2500 nm)

Pyrite is opaque in the visible portion of the spectrum, but some samples are transparent in the near-infrared portion.

non-transparent pyrite spectrum, 4K; Casapalca, Peru, 0.243 mm thick. Data File: 57 K;
transparent pyrite spectrum, 4K; Casapalca, Peru, 0.266 mm thick. Data File: 55 K;
transparent pyrite spectrum, 4K; Casapalca, Peru, 0.266 mm thick. Note the weak absorption band centered at about 2000 nm. Data File: 55 K;