Iodargyrite Mineral Data

Iodargyrite Mineral Data +

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General Iodargyrite Information

Chemical Formula:

AgI

Composition:

Molecular Weight = 234.77 gm

Silver 45.95 % Ag 49.35 % Ag₂O

Iodine 54.05 % I 54.05 % I

- % I -3.41 % -O=I₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

AgI

Environment:

Secondary mineral associated with weathered silver ores.

IMA Status:

Valid Species (Pre-IMA) 1854

Locality:

Broken Hill, New South Wales. Link to MinDat.org Location Data.

Name Origin:

Named after its chemical composition if iodine (Greek, iodes = "violet") and silver (Latin, argentum).

Synonym:

ICSD 65063

Iodyrite

PDF 9-374

Iodargyrite Image

Images:

Iodargyrite

Comments: Aggregate crystal of Iodargyrite on matrix.
Location: Broken Hill, New South Wales, Australia. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Images:

Iodargyrite Embolite

Comments: Cubo-octahedral crystals of iodaryrite (I) with smaller and darker octahedral crystals of embolite (E).
Location: Broken Hill, New South Wales, Australia. Scale: Specimen size 2x1 cm.
© Dave Barthelmy

Images:

Iodargyrite Coronadite

Comments: Dark, fine-grained massive coronadite with yellowish octahedral iodargyrite crystals.
Location: Broken Hill, New South Wales, Australia. Scale: Picture size 3x2 cm.
© Dave Barthelmy

Iodargyrite Crystallography

Axial Ratios:

a:c = 1:1.63538

Cell Dimensions:

a = 4.5922, c = 7.51, Z = 2; V = 137.16 Den(Calc)= 5.68

Crystal System:

Hexagonal - Dihexagonal PyramidalH-M Symbol (6mm) Space Group: P 6₃mc

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.73(1), 2.296(0.85), 3.98(0.6),

Forms:

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Forms: [ 9 9 2] [ 7 7 6] [ 9 9 4] [ 1 1 1] [ 1 1 1] [ 0 1 0] [ 0 0 1]

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Crystal Structure:

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Wyckoff R W G , Crystal Structures , 1 (1963) p.85-237, Second edition. Interscience Publishers, New York, New York, Note: wurtzite structure

Physical Properties of Iodargyrite

Cleavage:

[0001] Perfect

Color:

Colorless, Pale yellow, Yellow, Greenish yellow, Gray.

Density:

5.5 - 5.7, Average = 5.6

Diaphaniety:

Transparent to translucent

Fracture:

Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.

Habit:

Platy - Sheet forms (e.g. micas).

Hardness:

1.5-2 - Talc-Gypsum

Luster:

Adamantine - Greasy

Streak:

white

Optical Properties of Iodargyrite

Gladstone-Dale:

CI meas= -0.055 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.04 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2139,KPDmeas= 0.217,KC= 0.2056

Optical Data:

Uniaxial (+), w=2.21, e=2.22, bire=0.0100.

Calculated Properties of Iodargyrite

Electron Density:

r_electron=4.84 gm/cc
note: r_Iodargyrite=5.68 gm/cc.

Fermion Index

Fermion Index = 0
Boson Index = 1

Photoelectric:

PE_Iodargyrite= 336.51 barns/electron
U=PE_Iodargyrite x r_electron=1,628.30 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Iodargyrite is Not Radioactive

Iodargyrite Classification

Dana Class:

9.1.5.1 (9)Anhydrous and Hydrated Halides

(9.1)where A X

(9.1.5)Dana Group

9.1.5.1 Iodargyrite AgI P 6₃mc 6mm

Strunz Class:

III/A.03-10 III - Halogenides

III/A - Simple halogenides, without water Metal : Halogen = 1 : 1

III/A.03 - Jordargyrite - Tocornalite series

III/A.03-10 Iodargyrite AgI P 6₃mc 6mm

III/A.03-20 Tocornalite (Ag,Hg)I(?) Hex ? Hex

Other Iodargyrite Information

References:

NAME( Emsley91) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Iodargyrite

AgI
Dana No: 9.1.5.1 Strunz No: III/A.03-10
Locality:

Notes: