NDLI: Spectra of Phosphate Minerals as Obtained by Visible-Near Infrared Reflectance, Thermal Infrared Emission, and Mössbauer Laboratory Analyses

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Spectra of Phosphate Minerals as Obtained by Visible-Near Infrared Reflectance, Thermal Infrared Emission, and Mössbauer Laboratory Analyses

Content Provider	Semantic Scholar
Author	Dyar, Melinda Darby Bishop, James
Copyright Year	2007
Abstract	Introduction: Here we present an initial survey of phosphate minerals using three spectroscopic techniques including visible-near infrared (VNIR) reflectance, thermal infrared (TIR) emission, and Mössbauer spectroscopies. We are studying both common and unusual terrestrial phosphate samples in order to establish multi-technique libraries of well-characterized samples. These spectral libraries will be used for analysis of remote-sensing data, including the phosphate-rich, bright soil at Paso Robles, Mars. Visible-Near Infrared: Reflectance spectra of several phosphate minerals are shown in Figure 1. The spectra of apatite (Ca5(PO4)3(F,Cl)) and hydroxylapatite (Ca5(PO4)3(OH)) powders were acquired at RELAB/Brown University from 0.3 to 5.0 μm by splicing visible/near-infrared bidirectional spectra (measured relative to Halon) with FTIR spectra measured under H2O-purged conditions (relative to a rough gold surface). The splice was made near 1.2 μm. FTIR-only spectra of plumbogummite (PbAl3(PO4)2(OH)5 · H2O) and amblygonite ((Li,Na)Al(PO4)(F,OH)) powders also were acquired at RELAB. Reflectance spectra of the ferrolaueite (FeFe2 (PO4)2(OH)2 · 8H2O) powder and the coconinoite-spotted (Fe2 Al2(UO2)2(PO4)4(SO4)(OH)2 · 20H2O) rock surface were measured using an ASD spectrometer (from 0.3-2.5 μm) under ambient conditions at the SETI Institute.
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://www.lpi.usra.edu/meetings/lpsc2007/pdf/2210.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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