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Mineralpedia Details for Iodargyrite

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Iodargyrite

Iodargyrite

Named for the composition of iodine (iod) and silver, after the Greek word argyros (argyr). Somewhat uncommon, Idoargyrite can be found in abundance or of good quality in localities in Mexico, the United States, Chile, Australia, Germany, Spain, France, and Kazakhstan. Iodargyrite forms as a secondary mineral in oxidized silver-bearing deposits.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/iodargyrite.pdf

Formula
AgI 
Crystal System
Hexagonal 
Crystal Habit
Platy 
Cleavage
Perfect, None, None 
Luster
Adamantine - Greasy 
Color
colorless, pale yellow, yellow, greenish yellow, gray 
Streak
white 
Class
Hexagonal - Dihexagonal Pyramidal 
Fracture
Conchoidal - Uneven 
Hardness
1.5-2 
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Iodargyrite from Broken Hill, New South Wales, Australia

Iodargyrite
            from Broken Hill, New South Wales, Australia

Light lemon yellow glassy, well-formed crystals to 3mm in a 7mm group.

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Iodargyrite from Bisbee, Cochise Co., Arizona, United States

Iodargyrite
            from Bisbee, Cochise Co., Arizona, United States

Crystals of waxy gray-green Iodargyrite with odd shaped crystal growths and some nearly gemmy well formed crystals to <1mm totally filling the large open vuggy areas to 2.5cm in matrix.

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