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Paradocrasite

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Formula:
Sb3As
System:
Monoclinic
Colour:
Silver-white
Lustre:
Metallic
Hardness:
3
Name:
From Greek for παραδοξσ - contrary to expectation, κρασις - alloy) since closely associated dyscrasite was named for "bad alloy"
This page provides mineralogical data about Paradocrasite.


Classification of Paradocrasite

Approved
1.CA.15

1 : ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides)
C : Metalloids and Nonmetals
A : Arsenic group elements
Dana 7th ed.:
1.3.3.1
1.3.1.7

1 : NATIVE ELEMENTS AND ALLOYS
3 : Semi-metals and non-metals
1.43

1 : Elements and Alloys (including the arsenides, antimonides and bismuthides of Cu, Ag and Au)

Physical Properties of Paradocrasite

Metallic
Diaphaneity (Transparency):
Opaque
Colour:
Silver-white
Streak:
black
Hardness (Mohs):
3
Hardness (Vickers):
VHN100=118 kg/mm2
Tenacity:
Brittle
Cleavage:
Perfect
Fracture:
Splintery
Density:
6.5 g/cm3 (Measured)    6.44 g/cm3 (Calculated)

Optical Data of Paradocrasite

Type:
Anisotropic
Anisotropism:
Strong vivid tints of pink, pale orange, yellow, pale greenish-blue, pale green
Colour in reflected light:
white
Internal Reflections:
None
Pleochroism:
Visible
Comments:
Air - yellowish white with a slightly pinkish tint, to slightly grayish white
Oil - pale pink, white, gray with a very faint blue-green tint;

Chemical Properties of Paradocrasite

Formula:
Sb3As
Elements listed in formula:

Crystallography of Paradocrasite

Crystal System:
Monoclinic
Class (H-M):
2 - Sphenoidal
Space Group:
B2
Space Group Setting:
C2
Cell Parameters:
a = 7.252(1) Å, b = 4.172(4) Å, c = 4.431(2) Å
β = 123.84(127)°
Ratio:
a:b:c = 1.738 : 1 : 1.062
Unit Cell Volume:
V 111.35 ų (Calculated from Unit Cell)
Z:
1
Twinning:
polysynthetic

Type Occurrence of Paradocrasite

General Appearance of Type Material:
stubby prisms
Place of Conservation of Type Material:
U. S. National Museum specimen USNM R-419
Geological Setting of Type Material:
Silver nickel-cobalt arsenide vein
Associated Minerals at Type Locality:

Relationship of Paradocrasite to other Species

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
1.31AnyuiiteAuPb2
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
1.44HorsforditeCu, Sb
1.45CuprostibiteCu2(Sb,Tl)
1.46Allargentum(Ag1-xSbx)
1.47AurostibiteAuSb2
1.48DyscrasiteAg3Sb
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(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 Paradocrasite

Name in Other Languages:

Other Information

Other Information:
Etch tests HNO3 (+); instantly darkens the surface and forms a permanent iridescent stain that reveals twinning. HCl(+); fumes produce faint brown halo, soluble in water. FeCl3(+); quickly darkens the surface, forms a permanent iridescent stain that reveals twinning, and etches the surface slightly. HgCl2(+); forms a brown stain, mostly soluble in water. KCN and KOH( - ) .
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Paradocrasite

Reference List:
Leonard B F, Mead C W, Finney J J (1971) Paradocrasite, Sb2(Sb,As)2, a new mineral. American Mineralogist 56, 1127-1146

Internet Links for Paradocrasite

mindat.org URL:
https://www.mindat.org/min-3087.html
Please feel free to link to this page.

Localities for Paradocrasite

This 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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Australia (TL)
 
  • New South Wales
    • Yancowinna Co.
AM 1971, 1127-46
L.Lawrence, A.R.Ramsden & I.T.Graham 1999. On oxidation of Dyscrasite and associated minerals of the Consols Lode, Broken Hill, New South Wales. Australian Journal of Mineralogy Vol.5, No.2, Dec.1999, pp. 63-68; Vera Munro-Smith (2006) Cobalt Mineralisation in Selected Australian Deposits. PhD thesis, University of Western Sydney.
Canada
 
  • British Columbia
    • Atlin Mining Division
      • Tagish Lake
Described from the Engineer Mine by Cureton 1996 [Min Rec 27(1)70-71]. Gunnar Farber
Finland
 
  • Western and Inner Finland Region
    • Seinäjoki
Hytönen, Kai 1999. Suomen Mineraalit. Oivanen, P. unpublished Gtk:n kallioperäosaston mineralogian laboratorin röntgenajo 15658.
Mexico
 
  • Sonora
    • Mun. de Moctezuma
      • Moctezuma
Handbook of Mineralogy
"Handbook of Mineralogy" Anthony, Bideaux, Bladh, and Nichols. Ruff website.
Poland
 
  • Lower Silesia (Dolnośląskie)
    • Ząbkowice District
      • Ząbkowice (Frankenstein)
        • Szklary (Gläsendorf)
Geologia Sudetica, 33 (1): 23-31. ; Pieczka, A.; Grew, E.S.; Groat, L.A.; Evans, R.J. (2011): Holtite and dumortierite from the Szklary Pegmatite, Lower Silesia, Poland. Mineralogical Magazine 75, 303-315.
Mineral and/or Locality  
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