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Bromargyrite

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Formula:
AgBr
System:IsometricColour:Yellowish, greenish ...
Hardness:
Member of:Chlorargyrite Group
Name:In allusion to its composition, containing BROMine and the Greek for silver, ARGYros.

Classification of Bromargyrite

IMA status:Approved
Strunz 8th edition ID:3/A.02-60
Nickel-Strunz 10th (pending) edition ID:3.AA.15

3 : HALIDES
A : Simple halides, without H2O
A : M:X = 1:1, 2:3, 3:5, etc.
Dana 8th edition ID:9.1.4.2

9 : NORMAL HALIDES
1 : AX
Hey's CIM Ref.: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

Type Locality:Plateros, Zacatecas, Mexico
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

Lustre: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 (measured):6.474 g/cm3
Density (calculated):6.477 g/cm3

Crystallography of Bromargyrite

Crystal System:Isometric
Class (H-M):m3m (4/m 3 2/m) - Hexoctahedral
Space Group:Fm3m {F4/m 3 2/m}
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:
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
Maximum 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:Ag, Br
All elements listed in formula:Ag, Br
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

Member of:Chlorargyrite Group
Other Members of Group:

- +
Common Associates:
WulfeniteWadSilverPyromorphiteMalachite
LimoniteJarositeIodargyriteChlorargyriteCerussite
Atacamite
Related Minerals - Nickel-Strunz Grouping):

- +
3.AA.05Marshite
CuI
3.AA.05Miersite
(Ag,Cu)I
3.AA.05Nantokite
CuCl
3.AA.05UM1999-11:I:CuS
Cu(I,S)
3.AA.10Iodargyrite
AgI
3.AA.10Tocornalite
(Ag,Hg)I
3.AA.15Chlorargyrite
AgCl
3.AA.20Carobbiite
KF
3.AA.20Griceite
LiF
3.AA.20Halite
NaCl
3.AA.20Sylvite
KCl
3.AA.20Villiaumite
NaF
3.AA.25Salammoniac
NH
 
4
Cl
3.AA.25UM1998-03-Cl:Tl
TlCl
3.AA.25Lafossaite
Tl(Cl,Br)
3.AA.30Calomel
(Hg
+
2
)Cl
 
2
3.AA.30Kuzminite
(Hg
+
2
)(Br,Cl)
 
2
3.AA.30Moschelite
(Hg
+
2
)I
 
2
3.AA.35Neighborite
NaMgF
 
3
3.AA.40Chlorocalcite
KCaCl
 
3
3.AA.45Kolarite
PbTeCl
 
2
3.AA.50Radhakrishnaite
PbTe
 
3
(Cl,S)
 
2
3.AA.55Challacolloite
KPb
 
2
Cl
 
5
3.AA.60Hephaistosite
TlPb
 
2
Cl
 
5
Related Minerals - Hey's Index Grouping:

- +
8.3.1Chlorargyrite
AgCl
8.3.3Bromian Chlorargyrite
Ag(Cl,Br)
8.3.4Iodargyrite
AgI
8.3.5Miersite
(Ag,Cu)I

Other Names for Bromargyrite

Synonyms:
Bromic SilverBromide of SilverBromiteBromyriteChorobromite
Plata cornea amarilla meladaPlata verde
Other Languages:
French:Bromure d'Argent
German:Bromargyrit
Bromit
Bromsilber
Bromspat
Bromyrit
Russian:Бромаргирит
Simplified Chinese:溴银矿
Spanish:Bromargyrita
Bromita
Bromyrita
Varieties:
Chlorian BromargyriteIodian BromargyriteMercuroan Bromargyrite

Other Information

Fluorescence in UV light:None
Thermal Behaviour:Melts at 434°.
Health Warning: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

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  • Bromargyrite details from Handbook of Mineralogy (PDF)
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    Localities for Bromargyrite

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