SHELL
Species: Shell
Mohs Hardness: 3 out of 10 Color: Wide range of colors, and can be multi-colored due to banded layers. Can also have phenomena such as iridescence. RI: 1.530 to 1.685 Birefringence: 0.155 (birefringence blink) SR/DR/AGG: AGG Optic Character: Uniaxial positive Spectrum: Not diagnostic Fluorescence: Varies SG: 2.86 (+0.03 / -0.16) |