Neptunite Visible Spectra (300 - 1200 nm)

Image of the neptunite absorption spectrum

• GRR 211 spectrum; from Santa Rita Peak, San Benito County, California, USA, 0.075 mm thick sample. The color of this material comes from the Fe²⁺ - Ti⁴⁺ intervalence charge transfer. It is black when thick and orange when thin. Data Files: E||a; E||g;

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