This paper reports the water content per unit cell and diffuse reflectance spectra of five samples of fully hydrated Co(II) A-zeolites with different CO2+ ion loadings. It is suggested that each of the hydrated Co A-zeolite investigated contains per unit cell one Co (H2O)62+ complex in the centre of beta cavity (or sodalite unit) [1] and the other CO2+ ions reside as hexa-aquo complexes in the alpha cavity of the zeolite framework. Small shift of band maxima toards higher frequency for samples with lower Co2+ ion loadings was measured and interpreted.