Iodyrite or iodargyrite is a natural mineral form of silver iodide. It is a yellowish or greenish hexagonal mineral AgI consisting of native silver iodide usually occurring in thin plates. It is is not radioactive. It is related to chlorargyrite and bromargyrite.
General Information:
- Category: Halide minerals
- Formula: AgI
- Crystal system: Hexagonal
- Crystal class: Dihexagonal pyramidal (6mm)
Fig: Iodyrite – a natural mineral form of silver iodide
Properties
- Color: Colorless (fresh); pale yellow, yellow, greenish yellow, brownish, grayish
- Mohs scale hardness: 1.5 – 2
- Luster: Adamantine, resinous
- Streak: Yellow (shining)
- Diaphaneity: Transparent, translucent
- Specific gravity: 5.69
- Optical properties: Uniaxial (+)
Occurrence
It is a mineral, AgI, that is a naturally occurring form of silver iodide, is yellowish or greenish in color, is found in parts of Central and South America, and is hexagonal in shape
Information Source:
