Bromargyrite Mineral Data

Bromargyrite Mineral Data +

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General Bromargyrite Information

Chemical Formula:

AgBr

Composition:

Molecular Weight = 187.77 gm

Silver 57.45 % Ag 61.71 % Ag₂O

Bromine 42.55 % Br 42.55 % Br

- % Br -4.26 % -O=Br₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

AgBr

Environment:

Oxidized portions of silver deposits.

IMA Status:

Valid Species (Pre-IMA) 1841

Locality:

Mexico, Chile. Link to MinDat.org Location Data.

Name Origin:

Named after its composition of bromine (Greek, bromos - "stench") and silver (Latin, argentum).

Synonym:

Bromyrite

Embolite-Cl

ICSD 65061

PDF 6-438

Bromargyrite Image

Images:

Bromargyrite

Comments: Butterscotch colored bromargyrite cube.
Location: Broken Hill, New South Wales, Australia. Scale: Size Not Given.
© Lou Perloff / Photo Atlas of Minerals

Bromargyrite Crystallography

Cell Dimensions:

a = 5.7745, Z = 4; V = 192.55 Den(Calc)= 6.48

Crystal System:

Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: F m3m

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

By Intensity(I/I_o): 2.886(1), 2.041(0.55), 1.667(0.16),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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Help on Above

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

Physical Properties of Bromargyrite

Cleavage:

None

Color:

Greenish brown, Gray green, Grayish yellow, Yellow, Olive green.

Density:

5.8 - 6, Average = 5.9

Diaphaniety:

Transparent to translucent

Fracture:

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

Hardness:

1.5-2 - Talc-Gypsum

Luster:

Adamantine - Greasy

Streak:

gray

Optical Properties of Bromargyrite

Gladstone-Dale:

CI meas= -0.081 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.016 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1929,KPDmeas= 0.2119,KC= 0.196

Optical Data:

Isotropic, n=2.25.

Calculated Properties of Bromargyrite

Electron Density:

r_electron=5.66 gm/cc
note: r_Bromargyrite=6.48 gm/cc.

Fermion Index

Fermion Index = 0
Boson Index = 1

Photoelectric:

PE_Bromargyrite= 188.51 barns/electron
U=PE_Bromargyrite x r_electron=1,066.92 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Bromargyrite is Not Radioactive

Bromargyrite Classification

Dana Class:

9.1.4.2 (9)Anhydrous and Hydrated Halides

(9.1)where A X

(9.1.4)Dana Group

9.1.4.0 Embolite* Ag(Br,Cl) F m3m 4/m 3 2/m

9.1.4.1 Chlorargyrite AgCl F m3m 4/m 3 2/m

9.1.4.2 Bromargyrite AgBr F m3m 4/m 3 2/m

Strunz Class:

III/A.02-60 III - Halogenides

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

III/A.02 - Halite series Griceite - Bromargyrite

III/A.02-05 Griceite LiF F m3m 4/m 3 2/m

III/A.02-10 Villiaumite NaF F m3m 4/m 3 2/m

III/A.02-20 Carobbiite KF F m3m 4/m 3 2/m

III/A.02-30 Halite NaCl F m3m 4/m 3 2/m

III/A.02-40 Sylvite KCl F m3m 4/m 3 2/m

III/A.02-50 Chlorargyrite AgCl F m3m 4/m 3 2/m

III/A.02-60 Bromargyrite AgBr F m3m 4/m 3 2/m

Other Bromargyrite Information

References:

NAME( Emsley91) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

See Also:

Links to other databases for Bromargyrite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Bromargyrite

AgBr
Dana No: 9.1.4.2 Strunz No: III/A.02-60
Locality:

Notes: