aBALONE SHELL
Variety: Mother of Pearl
Species: Shell Mohs Hardness: 2.5 to 4.5 out of 10 Color: Gray or black with intense iridescent patterns RI: 1.530 to 1.685 Birefringence: 0.155 (Birefringence blink technique) SR/DR/AGG: AGG Spectrum: Not diagnostic Fluorescence: Variable SG: 2.86 (+0.03/-0.16) |