Band 621.0 cm^-1: ν₄ of (CO₃)^2- in Brugnatellite Band 690.0 cm^-1: ν₄ of (CO₃)^2- in Brugnatellite Band 700.0 cm^-1: ν₄ of (CO₃)^2- in Brugnatellite Band 779.0 cm^-1: ν₂ of (CO₃)^2- in Brugnatellite Band 1071.0 cm^-1: ν₁ of (CO₃)^2- in Brugnatellite Band 1098.0 cm^-1: ν₁ of (CO₃)^2- in Brugnatellite Band 1350.0 cm^-1: ν₃ of (CO₃)^2- in Brugnatellite Band 1451.0 cm^-1: ν₃ of (CO₃)^2- in Brugnatellite

Band 988.0 cm^-1: δ of Fe³⁺ · ⁻O-H in Brugnatellite Band 3642.0 cm^-1: ν of Fe³⁺ · ⁻O-H in Brugnatellite Band 3654.0 cm^-1: ν of Fe³⁺ · ⁻O-H in Brugnatellite Band 3685.0 cm^-1: ν of Fe³⁺ · ⁻O-H in Brugnatellite Band 3696.5 cm^-1: ν of Fe³⁺ · ⁻O-H in Brugnatellite

Band 938.0 cm^-1: δ of Mg²⁺ · ⁻O-H in Brugnatellite Band 3575.0 cm^-1: ν of Mg²⁺ · ⁻O-H in Brugnatellite Band 3594.0 cm^-1: ν of Mg²⁺ · ⁻O-H in Brugnatellite

Band 1591.0 cm^-1: ν₂ of H₂O in Brugnatellite Band 1657.0 cm^-1: ν₂ of H₂O in Brugnatellite Band 3030.0 cm^-1: ν₁ of H₂O in Brugnatellite Band 3230.0 cm^-1: ν₃ of H₂O in Brugnatellite