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Dyscrasite

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Formula:
Ag3Sb
System:
Orthorhombic
Colour:
Silver White
Lustre:
Metallic
Hardness:
3½ - 4
Name:
From δνσκράσις, a bad alloy.
This page provides mineralogical data about Dyscrasite.

Classification of Dyscrasite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
2.AA.35

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
A : Alloys
A : Alloys of metalloids with Cu, Ag, Au
2.2.1.1

2 : SULFIDES
2 : AmBnXp, with (m+n):p = 3:1
1.48

1 : Elements and Alloys (including the arsenides, antimonides and bismuthides of Cu, Ag and Au)
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http://www.mindat.org/min-1342.html
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Type Occurrence of Dyscrasite

Year of Discovery:
1797

Occurrences of Dyscrasite

Geological Setting:
Hydrothermal veins, especially Ni-Co-Ag-As veins.

Physical Properties of Dyscrasite

Metallic
Diaphaneity (Transparency):
Opaque
Colour:
Silver White
Comment:
Tarnishes to lead gray, yellowish or black
Streak:
Silver-white
Hardness (Mohs):
3½ - 4
Hardness (Vickers):
VHN100=153 - 179 kg/mm2
Tenacity:
Sectile
Cleavage:
Distinct/Good
Distinct on {001} {001}
Imperfect on {110}
Fracture:
Irregular/Uneven
Comment:
Sectile, but brittle
Density:
9.712 g/cm3 (Measured)    9.720 g/cm3 (Calculated)

Crystallography of Dyscrasite

Crystal System:
Orthorhombic
Class (H-M):
mm2 - Pyramidal
Space Group:
Pmm2
Cell Parameters:
a = 3.008Å, b = 4.828Å, c = 5.214Å
Ratio:
a:b:c = 0.623 : 1 : 1.08
Unit Cell Volume:
V 75.72 ų (Calculated from Unit Cell)
Z:
1
Morphology:
Pryamidal crystals, prismatic to platy, striated; granular, foliated, massive
Twinning:
On {110} giving pseudohexagonal forms and V-shapes

Crystallographic forms of Dyscrasite

Crystal Atlas:
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Dyscrasite - {111}, {021}
3d models and HTML5 code kindly provided by www.smorf.nl.

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Optical Data of Dyscrasite

Type:
Anisotropic
Anisotropism:
Weak
Pleochroism:
Weak

Chemical Properties of Dyscrasite

Formula:
Ag3Sb
Essential elements:
All elements listed in formula:
Common Impurities:
Hg

Relationship of Dyscrasite to other Species

2.AA.10aAlgodonite(Cu1-xAsx)
2.AA.10bDomeykiteCu3As
2.AA.10dKoutekiteCu5As2
2.AA.15NovákiteCu20AgAs10
2.AA.20CuprostibiteCu2(Sb,Tl)
2.AA.25KutinaiteAg6Cu14As7
2.AA.30Allargentum(Ag1-xSbx)
2.AA.40MaldoniteAu2Bi
2.AA.45StistaiteSnSb
1.1CopperCu
1.2SilverAg
1.5GoldAu
1.6AuricuprideCu3Au
1.7Tetra-auricuprideAuCu
1.8ZincZn
1.9CadmiumCd
1.10DanbaiteCuZn2
1.11ZhanghengiteCuZn
1.12MercuryHg
1.13KolymiteCu7Hg6
1.14MoschellandsbergiteAg2Hg3
1.15EugeniteAg11Hg2
1.16SchachneriteAg1.1Hg0.9
1.17ParaschachneriteAg3Hg2
1.18LuanheiteAg3Hg
1.19Weishanite(Au,Ag)3Hg2
1.20IndiumIn
1.21AluminiumAl
1.22Khatyrkite(Cu,Zn)Al2
1.23Cupalite(Cu,Zn)Al
1.24DiamondC
1.25GraphiteC
1.26ChaoiteC
1.27LonsdaleiteC
1.28SiliconSi
1.29TinSn
1.30LeadPb
1.31AnyuiiteAu(Pb,Sb)2
1.31NovodnepriteAuPb3
1.32LeadamalgamPb0.7Hg0.3
1.33ArsenicAs
1.34ArsenolampriteAs
1.35PaxiteCuAs2
1.36KoutekiteCu5As2
1.37DomeykiteCu3As
1.38Algodonite(Cu1-xAsx)
1.39NovákiteCu20AgAs10
1.40KutinaiteAg6Cu14As7
1.41AntimonySb
1.42StibarsenAsSb
1.43ParadocrasiteSb3As
1.44HorsforditeCu, Sb
1.45CuprostibiteCu2(Sb,Tl)
1.46Allargentum(Ag1-xSbx)
1.47AurostibiteAuSb2
1.49BismuthBi
1.50MaldoniteAu2Bi
1.51SulphurS8
1.52RosickýiteS
1.53SeleniumSe
1.54TelluriumTe
1.55ChromiumCr
1.56RheniumRe
1.57IronFe
1.58ChromferideFe3Cr1-x (x=0.6)
1.59FerchromideCr3Fe1-x
1.60WairauiteCoFe
1.61NickelNi
1.62Kamacite(Fe,Ni)
1.63Taenite(Fe,Ni)
1.64TetrataeniteFeNi
1.65AwaruiteNi3Fe
1.66Palladium(Pd,Pt)
1.67PotaritePdHg
1.68PaolovitePd2Sn
1.69Stannopalladinite(Pd,Cu)3Sn2
1.70CabriitePd2CuSn
1.71Taimyrite-I(Pd,Cu,Pt)3Sn
1.72Atokite(Pd,Pt)3Sn
1.73Rustenburgite(Pt,Pd)3Sn
1.74Zvyagintsevite(Pd,Pt,Au)3(Pb,Sn)
1.75PlumbopalladinitePd3Pb2
1.76Osmium(Os,Ir,Ru)
1.77Iridium(Ir,Os,Ru)
1.82PlatinumPt
1.83HongshiitePtCu
1.84NiggliitePtSn
1.85IsoferroplatinumPt3Fe
1.86TetraferroplatinumPtFe
1.87TulameenitePt2CuFe
1.88FerronickelplatinumPt2FeNi
1.89Rhodium(Rh,Pt)

Other Names for Dyscrasite

Other Information

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:
Minor silver ore

References for Dyscrasite

Reference List:
Klaproth, M.H. (1797): Untersuchung des Spießglanzsilbers von Wolfach, Beiträge zur chemischen Kenntniss der Mineralkörper, Zweiter Band, Rottmann Berlin, 298-301

Palache, Charles, Harry Berman & Clifford Frondel (1944), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged, 834pp.: 173-175.

Canadian Mineralogist (1973): 11: 187-195.

Canadian Mineralogist(1976): 14: 139-142.

European Journal of Mineralogy: 8: 1347-1350.

Internet Links for Dyscrasite

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

Localities for Dyscrasite

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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