Iodargyrite
>
Iodyrite or iodargyrite is a natural mineral form of silver iodide.
Related minerals are chlorargyrite and bromargyrite. Wikipedia
Color: Colorless (fresh); pale yellow, yellow, greenish yellow, brownish, grayish
Crystal class: Dihexagonal pyramidal (6mm); H-M symbol: (6mm)
Crystal system: Hexagonal
Mohs scale hardness: 1+1⁄2 – 2
Optical properties: Uniaxial (+)