Gemstone ID - 532 nm

A23 - a

Species : Iolite (Cordierite)     
Chemical Formula :     Mg2Al4Si5O18
Identification Characteristics : 
Classification:  Silicate
Hardness:7 ~ 7.5     S.G.:2.53 ~ 2.78
Cleavage: Perfect
R.I.: 1.53 ~ 1.55        D.R.: 0.010     
Crystal System:  Orthorhombic
Fracture: Conchoidal
Spectral Characteristics:
256、293、426、554、575、670、972 (cm-1)

A23 - b 

Species : Iolite (Cordierite)     
Chemical Formula :     Mg2Al4Si5O18
Identification Characteristics : 
Classification:  Silicate
Hardness:7 ~ 7.5     S.G.:2.53 ~ 2.78
Cleavage: Perfect
R.I.: 1.53 ~ 1.55        D.R.: 0.010     
Crystal System:  Orthorhombic
Fracture: Conchoidal
Spectral Characteristics:
256、293、426、554、575、670、972 (cm-1)