What can this crystal be??? Hello, I have some crystals with the following properties which I am unfortunately unable to find out their chemical formula or name... any other material with the following characteristics will help too. Cubic with octahedral habit. RI : 1.5 - 1.6 Density : 1 - 1.25 gmcm^-3 Color : White Soluble in water. MP : about room temp. Transparent. & Its not toxic. Prosperous Regards.