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Gemstones 250x250

The Mineral iodargyrite

Yellow Iodargyrite Microrystals

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.

Chemical Formula

AgI

Color

Colorless, light yellow, beige, greenish yellow, and light gray

Crystal System

Hexagonal

Properties

Streak
White to yellowish-white
Hardness
1.5 - 2
Transparency
Transparent to translucent
Specific Gravity
5.5 - 5.7
Luster
Adamantine, Greasy
Cleavage
1,1
Fracture
Uneven
Tenacity
Sectile and ductile

Crystal Habits

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.

3D Crystal Atlas

Additional Information

Composition
Silver iodide, usually with chloride or bromide
In Group
Halides
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

Uses

Iodargyrite is an ore of silver.

Noteworthy Localities

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.

Common Mineral Associations

Chlorargyrite, Bromargyrite, Azurite, Limonite, Cuprite

iodargyrite Photos



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