Infrared Absorption of O—H Bonds in Some Micas and Other Phyllosilicates

摘要: The frequencies, relative intensities and pleochroism of OH stretching bands in some micas chlorites were studied, the following conclusions are drawn Trioctahedral 2:1 2:1:1 phyllosilicates, where all octahedral positions filled with Mg, will have an absorption band about 3700 cm−1. These OH-groups their axes normal to mineral’s cleavage. Substitution Fe2+ for Mg results a 3665 Intensity ratios indicate that two most commonly substitute same polyhedral group (pyramid). Decreasing occupancy phlogopite-lepidomelane group, increasing substitution R3+ causes lower frequencies. not very sensitive incident angle infrared beam. In Li-micas less than 50 per cent Li, rest Al Fe2+, it seems probable residing pyramid Li one cause 3580 Combinations or 3480 Dioctahedral phyllosilicates having Fe3+ 3620