Triphylite spectra

Triphylite Visible Spectra (300 - 2200 nm)

Triphylite, LiFePO₄,is a mineral of phosphate pegmatites. The spectrum is dominated by a pair of Fe²⁺ bands in the near-infrared region. It also contains Mn²⁺ which shows up as a sharp feature near 410 nm. The relative values of the indices of refraction change with iron content, so the optical directions, alpha, beta and gamma, do not always correspond to the same crystallographic direction. The mineral shares the olivine structure. The spectrum is dominated in the near-infrared by Fe²⁺ in the site equivalent to the M(2) site of olivine.

Pleochroic triphylite from Minas Gerais, Brazil

Image of the visible absorption spectrum
yellowish green triphylite spectrum; Center Stratford, New Hampshire, USA. Plotted as 0.05 mm thick. The indices of refraction of this crystal correspond to a crystal with 53 mole% Fe. Data File: alpha = c = 4.65 Å; beta = a = 5.97 Å ; gamma = b = 10.3 Å.
Triphylite spectrum; Serra Branca pegmatite, Paraíba, Brazil. Plotted as 10.0 mm thick. Composition: X(Fe)=0.546. Data contributed by Michail N. Taran, Kiev, Ukraine. Data Files: a = 6.048 Å = beta; b = 10.337 Å = gamma; c = 4.704 Å = alpha.

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last upgraded 10-July-2022

Triphylite Visible Spectra (300 - 2200 nm)

Image of the visible absorption spectrum

Link to references about the spectra of triphylite