Table 1.

Assignment of the carbonate ion vibrational modes observed in the IR and Raman spectra of the H5 and LH15 minerals and their derivatives. The OH stretching vibrations assigned to hydromagnesite and brucite are also given.

Normal Mode	IR Bands [cm−1]			Raman Bands [cm−1]
	Huntite	Hydromagnesite	Brucite	Huntite	Hydromagnesite	Dolomite	Calcite
ν 3	1438	1419
	1506	1477
ν 1	1112	1120		1117	1121	1098	1087
ν 2	868	795
	891	853
		885
ν 4	743	594
-OH stretching		3447	3698
		3512