The spectroscopic search for water in barite group sulfates.

This study examines the mid and near infrared spectra of a suite of natural and synthetic powdered minerals of the isostructural barite mineral group. The mid-infrared (MIR) spectra are wholly compliant with anhydrous high purity anglesite, celestine and barite. The complementary near-infrared (NIR) spectra contain bands at ca 1.

The near-infrared spectra of the alkali carbonates.

This study presents the first account of the near-infrared (NIR) spectra of the alkali carbonates: [CsCO] [RbCO] [KCO] [NaCO] and [LiCO]. Seven NIR bands (labelled [A] to [G] inclusive) within the [4000-6000cm] (2.5-1.

Crystal chemical correlations between the mid and near-infrared in carbonate minerals.

Near-infrared (NIR) spectra of carbonates have proved important in many disciplines including planetary exploration. Classically bands in the 4000-6000 cm(-1) (2.5-1.

The effect of the particle size on the fundamental vibrations of the [CO3(2-)] anion in calcite.

This study examines the effects of particle sizes between 3 and 121 μm on the fundamental vibrations of the [CO3(2-)] anion in calcite [CaCO3] as analyzed by total attenuated reflectance infrared spectroscopy (ATR-IR) and Raman spectroscopy (RS). The ATR-IR absorbance intensity ratios of the [ν4/ν3] [712 cm(-1)/1393 cm(-1)], [ν4/ν2] [712 cm(-1)/871 cm(-1)], and [ν2/ν3] [871 cm(-1)/1393 cm(-1)] share the same profile for grain size fractions 121 μm through to 42 μm mode. Between 42 and 3 μm mode the three ratios sharply decline in a systematic manner, consistent with a nonuniform decrease in spectral contrast of the [CO3(2-)] internal modes.