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Iodargyrite is an ore of silver, and is very similar to Chlorargyrite and Bromrargyrite. Iodargyrite contains the halogen iodine combined with silver, whereas Chlorargyrite contains chlorine, and Bromargyrite contains bromine. Iodargyrite is usually lighter in color than the other two.
Iodargyrite is named after its chemical composition: "iod" for iodine, and "argyros" for the Greek word used for silver. |
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Chemical Formula |
AgI |
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Composition |
Silver iodide, usually with chloride or bromide |
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Color |
Colorless, light yellow, beige, greenish yellow, and light gray |
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Streak |
White to yellowish-white |
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Hardness |
1.5 - 2 |
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Crystal System |
Hexagonal |
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Crystal Forms
and Aggregates |
As tabular or prismatic crystals which are usually in groups of small crystals. Also as barrel-shaped forms, in parallel or disjoined crystal groups, as rosettes, drusy, grainy, and massive. Crystals may be hemimorphic with different shapes on each side. |
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Transparency |
Transparent to translucent |
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Specific Gravity |
5.5 - 5.7 |
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Luster |
Adamantine, Greasy |
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Cleavage |
1,1 |
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Fracture |
Uneven |
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Tenacity |
Sectile and ductile |
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In Group |
Halides |
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Striking Features |
Color, luster, habits, and mode of occurrence |
| Environment |
As a secondary mineral in oxidation zones, forming in epithermal veins and hydrothermal replacement deposits of silver deposits. |
| Rock Type |
Sedimentary |
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Popularity (1-4)
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3 |
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Prevalence (1-3)
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3 |
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Demand (1-3) |
1 |
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Iodargyrite is an ore of silver.
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Iodargyrite is a very uncommon mineral. Its most well-known locality is Broken Hill, New South Wales, Australia. Well-formed micro-crystals of this mineral have also come from Échassières, Allier, France; Vrančice, in Příbram, Bohemia, Czech Republic; and the Clara Mine, Oberwolfach, Baden-Württemberg, Germany; and the Schöne Aussicht Mine, Dernbach, Rhineland-Palatinate, Germany. Bright yellow microcrystals associated with Cuprite have recently been coming from the Rubtsovoskoe Mine, near Poteryaevka, Altai, Russia.
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