Formula: AgI
Origin of name: From composition, (Greek argyros - silver)
Crystal system: Hexagonal
Crystal class: 6mm
Twinning: On {30-34}, may form fourlings
Unit cell: a = 4.592 Ǻ, c = 7.510 Ǻ
Colour: Colourless, pale yellow, yellow, greenish yellow, grey brownish
Diaphaneity:
Luster: Resinous to adamantine, pearly
Habit: Crystals prismatic or tabular, hemimorphic; massive, scaly or lamellar
Hardness: 1.5
Specific gravity: 5.69
Cleavage: 1; {0001} perfect
Tenacity: Conchoidal; sectile, flexible
Streak: Yellow
Synonyms/varieties: Iodite, Iodyrite
Comments:
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