Iodargyrite
A valid IMA mineral species
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About Iodargyrite
Formula:
AgI
Colour:
Colourless (fresh); pale yellow, yellow, greenish yellow, brownish, grayish
Lustre:
Adamantine, Resinous
Hardness:
1½ - 2
Specific Gravity:
5.69
Crystal System:
Hexagonal
Name:
After the composition, containing IODine and silver (Greek: ARGyros).
This page provides mineralogical data about Iodargyrite.
Unique Identifiers
Mindat ID:
2037
Long-form identifier:
mindat:1:1:2037:0
IMA Classification of Iodargyrite
Approved
First published:
1825
Classification of Iodargyrite
3.AA.10
3 : HALIDES
A : Simple halides, without H2O
A : M:X = 1:1, 2:3, 3:5, etc.
3 : HALIDES
A : Simple halides, without H2O
A : M:X = 1:1, 2:3, 3:5, etc.
9.1.5.1
9 : NORMAL HALIDES
1 : AX
9 : NORMAL HALIDES
1 : AX
8.3.4
8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
3 : Halides of Ag
8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
3 : Halides of Ag
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Iag | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Iodargyrite
Adamantine, Resinous
Transparency:
Transparent, Translucent
Colour:
Colourless (fresh); pale yellow, yellow, greenish yellow, brownish, grayish
Streak:
Yellow (shining)
Hardness:
1½ - 2 on Mohs scale
Tenacity:
Sectile
Cleavage:
Perfect
On {0001}.
On {0001}.
Fracture:
Conchoidal
Density:
5.69 g/cm3 (Measured) 5.709 g/cm3 (Calculated)
Optical Data of Iodargyrite
Type:
Uniaxial (+)
RI values:
nω = 2.21 nε = 2.22
Birefringence:
Occasionally exhibits undulose anomalous birefringence, with small 2V, due to mechanical deformation. Exhibits abnormal green interference colors.
Max. Birefringence:
δ = 0.010
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
Surface Relief:
Moderate
Dispersion:
Very large.
Chemistry of Iodargyrite
Mindat Formula:
AgI
Elements listed:
Common Impurities:
Cl,Br
Crystallography of Iodargyrite
Crystal System:
Hexagonal
Class (H-M):
6mm - Dihexagonal Pyramidal
Space Group:
P6mm
Cell Parameters:
a = 4.59 Å, c = 7.51 Å
Ratio:
a:c = 1 : 1.636
Unit Cell V:
137.02 ų (Calculated from Unit Cell)
Morphology:
Crystals usually prismatic [0001]; also tabular on [0001]. Development usually distinctly hemimorphic. Crystals are occasionally barrel-shaped, or occur as parallel groups or rosettes. They can also occur as massive aggregates, lamellae or scaly crystals.
Twinning:
On {3034}, repeated as fourlings at times. Paramorphs of iodargyrite after miersite show a mimetic repeated twinning with iodargyrite [001] parallel to {111} of the original miersite.
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0017951 | Iodargyrite | Aminoff G (1922) Ueber die Kristallstruktur von Ag I. _cod_database_code 1011050 Zeitschrift fur Kristallographie 57 180-185 | 1922 | 0 | 293 | ||
| 0011537 | Iodargyrite | Wyckoff R W G (1963) Second edition. Interscience Publishers, New York, New York Crystal Structures 1 85-237 | 1963 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.75 Å | (100) |
| 2.296 Å | (85) |
| 3.98 Å | (60) |
| 1.959 Å | (50) |
| 3.51 Å | (40) |
| 2.119 Å | (30) |
| 2.731 Å | (18) |
Comments:
Synthetic, ICDD 9-374.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47g : [Halogen-bearing surface weathering minerals] |
Geological Setting:
Oxidized zones of silver deposits.
Type Occurrence of Iodargyrite
Synonyms of Iodargyrite
Other Language Names for Iodargyrite
Catalan:Iodargirita
Czech:Jodargyrit
Dutch:Iodargyriet
French:Argent ioduré
Italian:Iodargirite
Russian:Иодаргирит
Simplified Chinese:碘银矿
Spanish:Iodargyrita
Iodita
Iodyrita
Iodita
Iodyrita
Common Associates
Associated Minerals Based on Photo Data:
| 19 photos of Iodargyrite associated with Chrysocolla | Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
| 18 photos of Iodargyrite associated with Azurite | Cu3(CO3)2(OH)2 |
| 15 photos of Iodargyrite associated with Goethite | Fe3+O(OH) |
| 13 photos of Iodargyrite associated with Coronadite | Pb(Mn4+6Mn3+2)O16 |
| 13 photos of Iodargyrite associated with Bromian Chlorargyrite | Ag(Cl,Br) |
| 12 photos of Iodargyrite associated with Chlorargyrite | AgCl |
| 11 photos of Iodargyrite associated with Alunite Supergroup | AD3(XO4)2(OH)6 |
| 7 photos of Iodargyrite associated with Turquoise | CuAl6(PO4)4(OH)8 · 4H2O |
| 6 photos of Iodargyrite associated with Jalpaite | Ag3CuS2 |
| 6 photos of Iodargyrite associated with Bromargyrite | AgBr |
Related Minerals - Strunz-mindat Grouping
| 3.AA. | Brontesite | (NH4)3PbCl5 |
| 3.AA.05 | Marshite | CuI |
| 3.AA.05 | Nantokite | CuCl |
| 3.AA.05 | UM1999-11:I:CuS | Cu(I,S) |
| 3.AA.05 | Miersite | (Ag,Cu)I |
| 3.AA.10 | Tocornalite | (Ag,Hg)I (?) |
| 3.AA.15 | Bromargyrite | AgBr |
| 3.AA.15 | Chlorargyrite | AgCl |
| 3.AA.20 | Sylvite | KCl |
| 3.AA.20 | Halite | NaCl |
| 3.AA.20 | Villiaumite | NaF |
| 3.AA.20 | Carobbiite | KF |
| 3.AA.20 | Griceite | LiF |
| 3.AA.25 | UM1998-03-Cl:Tl | TlCl |
| 3.AA.25 | Nataliyamalikite | TlI |
| 3.AA.25 | Lafossaite | Tl(Cl,Br) |
| 3.AA.25 | Salammoniac | NH4Cl |
| 3.AA.30 | Calomel | [Hg2]2+Cl2 |
| 3.AA.30 | Moschelite | [Hg2]2+I2 |
| 3.AA.30 | Kuzminite | [Hg2]2+(Br,Cl)2 |
| 3.AA.35 | Neighborite | NaMgF3 |
| 3.AA.35 | Parascandolaite | KMgF3 |
| 3.AA.40 | Javorieite | KFeCl3 |
| 3.AA.40 | Chlorocalcite | KCaCl3 |
| 3.AA.45 | Kolarite | PbTeCl2 |
| 3.AA.50 | Radhakrishnaite | PbTe3(Cl,S)2 |
| 3.AA.55 | Challacolloite | KPb2Cl5 |
| 3.AA.60 | Hephaistosite | TlPb2Cl5 |
| 3.AA.90 | Pseudocotunnite | K2PbCl4 |
Fluorescence of Iodargyrite
None.
Other Information
Thermal Behaviour:
The axial ratio and specific gravity decrease regularly to 146° where the substance inverts with absorption of heat to α-AgI, when heated.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Industrial Uses:
Ore of silver.
Internet Links for Iodargyrite
mindat.org URL:
https://www.mindat.org/min-2037.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
References for Iodargyrite
Reference List:
Barth, T., Lunde, G. (1925) The Effect of the Lanthanide Contraction on the Cubic Platinum Metals. Norsk Geologisk Tidsskrift [Norwegian Journal of Geology], 8 (3) 220-223
Kolkmeijer, Ν. H., Hengel, J. W. A. van (1934) Über das reguläre und das hexagonale Silberjodid. Zeitschrift für Kristallographie, 88 (1). 317 doi:10.1524/zkri.1934.88.1.317
Helmholz, Lindsay (1935) The Crystal Structure of Hexagonal Silver Iodide. The Journal of Chemical Physics, 3 (11) 740-747 doi:10.1063/1.1749584
(1962) International Mineralogical Association: Commission on New Minerals and Mineral Names. Mineralogical Magazine and Journal of the Mineralogical Society, 33 (258) 260-263 doi:10.1180/minmag.1962.033.258.09
Localities for Iodargyrite
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Argentina | |
| Minerals acquired from Mr. Nelson ... |
| Mr. Nelson Valenzuela. |
| Brodtkorb (2002) |
| Holley (2012) +1 other reference |
Australia | |
| Gilligan et al. (1993) |
| Adam McKinnon pers comm | |
| Leverett et al. (2003) |
| Gilligan et al. (1995) |
| Gilligan et al. (1995) | |
| Minerals of Broken Hill (1982) |
| Birch et al. (1997) | |
| Worner et al. (et al) | |
| Worner et al. (et al) | |
| Birch et al. (1997) |
| Museum Victoria collection |
| Day (1998) | |
| |
| Noble |
| Kolitsch et al. (1999) |
| www.minerals.statedevelopment.sa.gov.au (2017) +1 other reference |
| Uwe Kolitsch collection +1 other reference |
| |
| Francis (2010) |
| Hall (1987) |
| Jean Pierre Barral |
| Birch (1996) +1 other reference |
| Nickel et al. (1994) |
| Downes et al. (2006) |
| Gibb-Maitland (1908) |
| Nickel (1982) |
| Iodargyrite confirmed by Rob ... +1 other reference |
Austria | |
| Götzinger et al. (1994) |
Botswana | |
| Forrester +1 other reference |
Brazil | |
| Pires et al. (2020) |
Canada | |
| Boyle (1997) |
Chile | |
| Arfè et al. (2016) |
| Palache et al. (1951) |
| samples analysed by Gerhard Mohn and ... | |
| IMA submission #037-99 |
| Anthony et al. (2000) | |
| Reich et al. (2009) |
| Oviedo et al. (1991) |
| T. Kampf analysis |
| Moesta (1870) |
| samples analysed by Gerhard Mohn and ... |
| samples analysed by Gerhard Moehn. | |
| old sample properly labeled in the ... | |
| Palache et al. (1951) | |
| Henwood (1871) | |
| Moesta (1870) | |
| Dana 6:160 +2 other references | |
| Sample is in the Maurizio Dini ... | |
| Henwood (1871) | |
| A. Moesta +3 other references | |
| Henwood (1871) | |
| Moesta (1870) | |
| Chouinard et al. (2005) +1 other reference |
| Palache et al. (1951) |
China | |
| Zhida Yang (1991) |
| Qisong Sun (1992) | |
| Zhitian Wang et al. (1993) +2 other references |
| Jidong Guan and Xiaohong Chai (2004) +1 other reference |
Cuba | |
| Lastra-Rivero et al. (2018) |
Czech Republic | |
| [Lapis 1995 +1 other reference |
| J.Hyrsl (1992) | |
| Šrein |
| Vrtiška L et al. (2019) +2 other references |
| Pauliš et al. (2022) |
Dominican Republic | |
| E. Andreu et al. (2010) +1 other reference |
Finland | |
| Chernet |
France | |
| Queneau (n.d.) |
| Chollet Pascal Collection |
| Pierre Le Roch Collection |
| Palache et al. (1951) +1 other reference | |
| Lebocey (2012) |
| Jean Claude Dol collection. +1 other reference |
| Jean Claude Dol |
| Jean Claude Dol |
| Queneau (n.d.) +1 other reference |
| Favreau et al. (2014) |
| Favreau et al. (2014) | |
Germany | |
| 50. (in German) +2 other references |
| Collection of Steffen Michalski |
| Collection of Steffen Michalski | |
| Lapis (10) |
| Collection of Steffen Michalski |
| Heidtke (2001) |
| Heidtke (2001) |
| Wittern (2001) |
| Wagner et al. (1984) |
| Palache et al. (1951) +2 other references |
| Wittern (2001) |
| Wittern (2001) |
| Markus Gerstmann - Collection |
Greece | |
| Gelaude et al. (1996) |
| 42. +1 other reference | |
| ko Jansen. |
| Kilias et al. (2001) |
Hungary | |
| Szakáll: Minerals of Rudabánya |
| Szakáll: Minerals of Rudabánya | |
| Szakáll:Top. Min. Hun. |
Indonesia | |
| Nur et al. (2012) |
| Nur et al. (2011) | |
Iran | |
| Ali Sholeh et al. (2016) |
Italy | |
| Batacchi et al. (2011) |
| Muenchener Micromounter-Lithothek |
Japan | |
| Zeeck et al. (2021) |
Kazakhstan | |
| Konopelko et al. (2025) |
| Pavel.M. Kartashov (n.d.) |
| Palache et al. (1951) +1 other reference |
Mexico | |
| Panczner (1987) |
| Wilson et al. (1986) |
| Panczner (1987) |
| Panczner (1987) | |
| Panczner (1987) | |
| Panczner (1987) | |
| Panczner (1987) | |
| Panczner (1987) | |
| Panczner (1987) | |
| Panczner (1987) | |
| Anisimov et al. (2001) |
| Panczner (1987) |
| Panczner (1987) |
| Panczner (1987) |
| Panczner (1987) | |
| Panczner (1987) |
| Panczner (1987) |
| Panczner (1987) |
| Lapis 2001 (1) |
| Palache et al. (1951) +1 other reference |
| Panczner (1987) |
Mongolia | |
| Geochemical and mineralogical characteristics of the West Kasulu Cu–Au porphyry prospect et al. (2012) |
Namibia | |
| Niedermayr (2001) +1 other reference |
| Niedermayr et al. (2008) |
| Desor (11/2020) |
Palau | |
| Miller et al. (1987) |
Peru | |
| Yáñez et al. (2014, May) |
| Crespo +4 other references |
| Alfonso et al. (2023) |
Poland | |
| DOI: 10.1515/mipo-2016-0002 +2 other references |
Portugal | |
| Gomes et al. (2016) |
| Christian Rewitzer collection |
Russia | |
| webmineral.ru (2020) |
| Kasatkin et al. (2025) | |
| Minerals offered by Excalibur minerals +1 other reference |
| Kepezhinskas et al. (2023) |
| Vikentyev et al. (2025) |
| Kasatkin et al. (2022) |
| www.igem.ru (2001) +1 other reference |
| Kazachenko et al. (2008, August) |
| Frank-Kamenetskaya et al. (2021) |
| Azovskova et al. (2013, January) |
| Kuzhuget et al. (2015) |
| Kuzhuget et al. (2022) | |
| Kasatkin et al. (2014) |
Slovakia | |
| Ďuďa R. et al. (1993) |
| Vlasáč et al. (2025) |
| Vlasáč et al. (2025) +1 other reference | |
| Martin Števko-unpublished |
South Africa | |
| SAMS (South African Micromount Society) |
Spain | |
| Georges FAVREAU collection & EDX ... |
| BERTRAN-OLLER et al. (2012) |
| Favreau (n.d.) |
| S.Rust Collection | |
| Jean-Marie LAURENT collection |
| Sáinz de Baranda et al. (2004) |
| Palache et al. (1951) +1 other reference |
| Calvo et al. (1992) | |
| Calvo Rebollar et al. (2024) |
| Sainz de Baranda Graf et al. (2023) |
USA | |
| Graeme (1993) |
| Graeme (1993) +1 other reference | |
| Raman analysis by Dr. Hexiong Yang |
| "The Accidental Pocket" talk presented ... |
| Dana 7:II:24. +5 other references |
| Robert Jenkins Raman Spectroscopy |
| Anthony et al. (1995) |
| Anthony et al. (1995) | |
| Anthony et al. (1995) | |
| Anthony et al. (1995) | |
| Thomas (1949) +1 other reference |
| Dana 6:160. +3 other references |
| Williams et al. (1963) +1 other reference |
| Williams et al. (1963) +1 other reference | |
| Bideaux (1980) +1 other reference |
| Blanchard (1930) +1 other reference |
| Richard Josiah Hinton (1878) |
| Brian Beck Collected |
| Brian Beck collected | |
| Kampf et al. (2010) |
| Kampf et al. (2010) | |
| Collected by and in the collection of ... | |
| Housley R. | |
| Dr. Housley +1 other reference |
| Eckel et al. (1997) |
| Eckel et al. (1997) | |
| Eckel et al. (1997) |
| Shannon et al. (1985) |
| Shannon et al. (1985) |
| Shannon et al. (1985) | |
| Shannon et al. (1985) |
| Thorne (n.d.) |
| USBM Inf Circ 7093 (1939) |
| Castor et al. (2004) |
| Longwell et al. (1965) | |
| Castor et al. (2004) | |
| Hayes et al. (2008) | |
| Castor et al. (2004) |
| Castor et al. (2004) |
| Rocks & Minerals. Nov. 1999. | |
| Castor et al. (2004) | |
| Castor et al. (2004) | |
| Castor et al. (2004) |
| Silver Coin Mine. Compact Disc. Paul ... |
| Ebert et al. (1997) |
| Castor et al. (2004) |
| Castor et al. (2004) |
| Castor et al. (2004) |
| Castor et al. (2004) | |
| Castor et al. (2004) |
| Castor et al. (2004) | |
| Castor et al. (2004) |
| Schilling (1979) |
| Castor et al. (2004) | |
| Rocks & Min.:13:6-9. |
| Castor et al. (2004) | |
| - (2005) | |
| Castor et al. (2004) | |
| ex Franlklin Mineral Museum |
| Jensen (1993) +1 other reference |
| Jensen (1993) | |
| Ron Gibbs |
| Northrop et al. (1996) | |
| Northrop et al. (1996) |
| Northrop et al. (1996) | |
| Walstrom (n.d.) |
| Northrop et al. (1996) |
| NMBMGMR Open-file Report - 532 +1 other reference |
| Palache et al. (1951) +1 other reference |
| Dana 6: 789. | |
| Northrop et al. (1996) |
| Rankin (2002) |
| Alminas +2 other references |
Quick NavTopAbout IodargyriteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography Crystal StructureX-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesCommon AssociatesStrunz-MindatFluorescence Other InformationInternet Links References Localities Locality List
Ste Barbe vein, Montmins mining district, Échassières, Vichy, Allier, Auvergne-Rhône-Alpes, France