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Bromargyrite

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Formula:
AgBr
System:
Isometric
Colour:
Yellowish, greenish ...
Hardness:
Name:
In allusion to its composition, containing BROMine and the Greek for silver, ARGYros.

Classification of Bromargyrite

Approved
3.AA.15

3 : HALIDES
A : Simple halides, without H2O
A : M:X = 1:1, 2:3, 3:5, etc.
9.1.4.2

9 : NORMAL HALIDES
1 : AX
8.3.2

8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
3 : Halides of Ag
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Type Occurrence of Bromargyrite

Year of Discovery:
1859
Geological Setting of Type Material:
Oxidation zone of silver deposit.

Occurrences of Bromargyrite

Geological Setting:
In the oxidation zones of silver deposits, notably in arid regions

Physical Properties of Bromargyrite

Adamantine, Resinous, Waxy
Diaphaneity (Transparency):
Transparent, Translucent
Colour:
Yellowish, greenish brown, bright green
Streak:
White to yellowish white
Hardness (Mohs):
Tenacity:
Sectile
Cleavage:
None Observed
Fracture:
Irregular/Uneven, Sub-Conchoidal
Density:
6.474 g/cm3 (Measured)    6.477 g/cm3 (Calculated)

Crystallography of Bromargyrite

Crystal System:
Isometric
Class (H-M):
m3m (4/m 3 2/m) - Hexoctahedral
Space Group:
Fm3m
Cell Parameters:
a = 5.7745Å
Unit Cell Volume:
V 192.55 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Crystals cubic, with {111} and {011}, to 1 cm; in parallel or subparallel groups; commonly as crusts and coatings; also massive.
Twinning:
{111}, rare
Comment:
On synthetic material.
X-Ray Powder Diffraction Data:
d-spacingIntensity
2.886 (100)
2.041 (55)
1.667 (16)
1.291 (14)
1.1787 (10)
3.33 (8)
1.444 (8)
Comments:
Recorded on synthetic material

Optical Data of Bromargyrite

Type:
Isotropic
RI values:
n = 2.253
Max Birefringence:
δ = 0.000 - Isotropic minerals have no birefringence
Surface Relief:
Very High
Type:
Isotropic
Comments:
Mechanically deformed crystals may be weakly birefringent with lamellar or undulose extinction

Chemical Properties of Bromargyrite

Formula:
AgBr
Essential elements:
All elements listed in formula:
Analytical Data:
(1) Chemical analysis of material from Rancho de San Onofre, Charcas, Mexico
(2) Theoretical values for Ag(Br,Cl) with Br:Cl = 1:1
       (1)      (2)

Ag   (57.56)  (65.16)
Cl            (10.71)
Br   (42.44)  (24.13)

sum  100.00   100.00 wt.-%
Common Impurities:
Cl,I

Relationship of Bromargyrite to other Species

Other Members of Group:
3.AA.05MarshiteCuI
3.AA.05Miersite(Ag,Cu)I
3.AA.05NantokiteCuCl
3.AA.05UM1999-11:I:CuSCu(I,S)
3.AA.10IodargyriteAgI
3.AA.10Tocornalite(Ag,Hg)I
3.AA.15ChlorargyriteAgCl
3.AA.20CarobbiiteKF
3.AA.20GriceiteLiF
3.AA.20HaliteNaCl
3.AA.20SylviteKCl
3.AA.20VilliaumiteNaF
3.AA.25SalammoniacNH4Cl
3.AA.25UM1998-03-Cl:TlTlCl
3.AA.25LafossaiteTl(Cl,Br)
3.AA.30Calomel(Hg22+)Cl2
3.AA.30Kuzminite(Hg22+)(Br,Cl)2
3.AA.30Moschelite(Hg22+)I2
3.AA.35NeighboriteNaMgF3
3.AA.40ChlorocalciteKCaCl3
3.AA.45KolaritePbTeCl2
3.AA.50RadhakrishnaitePbTe3(Cl,S)2
3.AA.55ChallacolloiteKPb2Cl5
3.AA.60HephaistositeTlPb2Cl5

Other Names for Bromargyrite

Other Information

Thermal Behaviour:
Melts at 434°.
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.

References for Bromargyrite

Reference List:
Rammelsberg (1860): 196.

von Lasaulx (1878) Jb. Min.: 621.

Lovissato (1898) Acc. Linc. Rend.: 7: 246.

Levi and Tabet (1934) Acc. Linc., Rend.: (6): 19: 723.

Mott and Gurney (1940), Electronic Proc. in Ionic Crystals, Oxford.

Palache, Charles, Harry Berman & Clifford Frondel (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume II: Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Etc. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged: 11-15.

NBS Circ. (1955), 539, 4, 46-47.

American Mineralogist (1964), 49, 224.

Barclay, C. J. and Jones, J. B. (1971): The Broken Hill silver halides. J. Geol. Soc. Australia 18, 149-157.

Anthony, J. W. et al. (1997): Handbook of Mineralogy, Vol. 3, 78.

Internet Links for Bromargyrite

Specimens:
The following Bromargyrite specimens are currently listed for sale on minfind.com.

Localities for Bromargyrite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
Mineral and/or Locality  
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