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Paradocrasite

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About ParadocrasiteHide

Formula:
Sb3As
Colour:
Silver-white
Lustre:
Metallic
Hardness:
3
Specific Gravity:
6.5
Crystal System:
Monoclinic
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 ParadocrasiteHide

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 ParadocrasiteHide

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

Optical Data of ParadocrasiteHide

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 ParadocrasiteHide

Formula:
Sb3As
IMA Formula:
Sb2(Sb,As)2

Crystallography of ParadocrasiteHide

Crystal System:
Monoclinic
Class (H-M):
2 - Sphenoidal
Space Group:
B2
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 V:
111.35 ų (Calculated from Unit Cell)
Z:
1
Twinning:
polysynthetic

Type Occurrence of ParadocrasiteHide

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:

Synonyms of ParadocrasiteHide

Other Language Names for ParadocrasiteHide

Related Minerals - Nickel-Strunz GroupingHide

1.CA.05AntimonySbTrig. 3m (3 2/m) : R3m
1.CA.05ArsenicAsTrig. 3m (3 2/m) : R3m
1.CA.05BismuthBiTrig. 3m (3 2/m) : R3m
1.CA.05StibarsenAsSbTrig. 3m (3 2/m) : R3m
1.CA.10ArsenolampriteAsOrth. mmm (2/m 2/m 2/m)
1.CA.10Pararsenolamprite(As,Sb)Orth. mm2 : Pmn21

Related Minerals - Dana Grouping (8th Ed.)Hide

1.3.1.1ArsenicAsTrig. 3m (3 2/m) : R3m
1.3.1.2AntimonySbTrig. 3m (3 2/m) : R3m
1.3.1.3StibarsenAsSbTrig. 3m (3 2/m) : R3m
1.3.1.4BismuthBiTrig. 3m (3 2/m) : R3m
1.3.1.5StistaiteSnSbTrig. 3m (3 2/m) : R3m

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

1.1CopperCuIso. m3m (4/m 3 2/m) : Fm3m
1.2SilverAgIso. m3m (4/m 3 2/m) : Fm3m
1.5GoldAuIso. m3m (4/m 3 2/m) : Fm3m
1.6AuricuprideCu3AuOrth.
1.7Tetra-auricuprideAuCuTet.
1.8ZincZnHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
1.9CadmiumCdHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
1.10DanbaiteCuZn2Iso.
1.11ZhanghengiteCuZnIso.
1.12MercuryHgTrig. 3m (3 2/m) : R3m
1.13KolymiteCu7Hg6Iso.
1.14MoschellandsbergiteAg2Hg3Iso. m3m (4/m 3 2/m)
1.15EugeniteAg11Hg2Iso.
1.16SchachneriteAg1.1Hg0.9Hex.
1.17ParaschachneriteAg3Hg2Orth.
1.18LuanheiteAg3HgHex.
1.19Weishanite(Au,Ag)3Hg2Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
1.20IndiumInTet.
1.21AluminiumAlIso. m3m (4/m 3 2/m) : Fm3m
1.22Khatyrkite(Cu,Zn)Al2Tet.
1.23Cupalite(Cu,Zn)AlOrth.
1.24DiamondCIso. m3m (4/m 3 2/m) : Fd3m
1.25GraphiteCHex. 6mm : P63mc
1.26ChaoiteCHex. 6/mmm (6/m 2/m 2/m) : P6/mmm
1.27LonsdaleiteCHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
1.28SiliconSi
1.29TinSnTet. 4/mmm (4/m 2/m 2/m) : I41/amd
1.30LeadPbIso. m3m (4/m 3 2/m) : Fm3m
1.31AnyuiiteAuPb2Tet. 4/mmm (4/m 2/m 2/m) : I4/mcm
1.31NovodnepriteAuPb3Tet. 4 2m : I4 2m
1.32LeadamalgamPb0.7Hg0.3Tet. 4/mmm (4/m 2/m 2/m) : I4/mmm
1.33ArsenicAsTrig. 3m (3 2/m) : R3m
1.34ArsenolampriteAsOrth. mmm (2/m 2/m 2/m)
1.35PaxiteCuAs2Mon.
1.36KoutekiteCu5As2Hex.
1.37DomeykiteCu3AsIso. 4 3m : I4 3d
1.38Algodonite(Cu1-xAsx)Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
1.39NovákiteCu20AgAs10Mon.
1.40KutinaiteAg6Cu14As7 Iso.
1.41AntimonySbTrig. 3m (3 2/m) : R3m
1.42StibarsenAsSbTrig. 3m (3 2/m) : R3m
1.44HorsforditeCu, Sb
1.45CuprostibiteCu2(Sb,Tl)Tet. 4/mmm (4/m 2/m 2/m) : P4/nmm
1.46Allargentum(Ag1-xSbx)Hex.
1.47AurostibiteAuSb2Iso. m3 (2/m 3) : Pa3
1.48DyscrasiteAg3SbOrth. mm2 : Pmm2
1.49BismuthBiTrig. 3m (3 2/m) : R3m
1.50MaldoniteAu2BiIso. m3m (4/m 3 2/m) : Fd3m
1.51SulphurS8Orth. mmm (2/m 2/m 2/m) : Fddd
1.52RosickýiteSMon. 2/m : P2/b
1.53SeleniumSeTrig. 3 2 : P31 2 1
1.54TelluriumTeTrig. 3 2 : P31 2 1
1.55ChromiumCrIso. m3m (4/m 3 2/m) : Im3m
1.56RheniumReHex.
1.57IronFeIso. m3m (4/m 3 2/m) : Im3m
1.58ChromferideFe3Cr1-x (x=0.6)Iso. m3m (4/m 3 2/m) : Pm3m
1.59FerchromideCr3Fe1-xIso. m3m (4/m 3 2/m) : Pm3m
1.60WairauiteCoFe
1.61NickelNiIso. m3m (4/m 3 2/m) : Fm3m
1.62Kamacite(Fe,Ni)Iso.
1.63Taenite(Fe,Ni)Iso. m3m (4/m 3 2/m) : Fm3m
1.64TetrataeniteFeNiTet.
1.65AwaruiteNi3FeIso. m3m (4/m 3 2/m) : Fm3m
1.66Palladium(Pd,Pt)
1.67PotaritePdHgTet. 4/mmm (4/m 2/m 2/m) : P4/mmm
1.68PaolovitePd2SnOrth.
1.69Stannopalladinite(Pd,Cu)3Sn2Hex.
1.70CabriitePd2CuSnOrth. mmm (2/m 2/m 2/m) : Pmmm
1.71Taimyrite(Pd,Cu,Pt)3SnOrth.
1.72Atokite(Pd,Pt)3SnIso. m3m (4/m 3 2/m) : Fm3m
1.73Rustenburgite(Pt,Pd)3Sn
1.74ZvyagintsevitePd3PbIso.
1.75PlumbopalladinitePd3Pb2Hex.
1.76Osmium(Os,Ir,Ru)Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
1.77Iridium(Ir,Os,Ru)Iso.
1.82PlatinumPtIso. m3m (4/m 3 2/m) : Fm3m
1.83HongshiitePtCuTrig.
1.84NiggliitePtSnHex.
1.85IsoferroplatinumPt3FeIso.
1.86TetraferroplatinumPtFeTet.
1.87TulameenitePt2CuFeTet.
1.88FerronickelplatinumPt2FeNiTet.
1.89Rhodium(Rh,Pt)Iso.

Other InformationHide

Notes:
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 ParadocrasiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 ParadocrasiteHide

Localities for ParadocrasiteHide

ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Australia (TL)
 
  • New South Wales
    • Yancowinna Co.
      • Broken Hill district
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 Färber
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
    • Ząbkowice Slaskie 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.; Pieczka, A., Evans, R. J., Grew, E. S., Groat, L. A., Ma, C., & Rossman, G. R. (2013). The dumortierite supergroup. II. Three new minerals from the Szklary pegmatite, SW Poland: Nioboholtite,(Nb0. 6⃞0. 4) Al6BSi3O18, titanoholtite,(Ti0. 75⃞0. 25) Al6BSi3O18, and szklaryite, ⃞Al6BAs33+ O15. Mineralogical Magazine, 77(6), 2841-2856.
Mineral and/or Locality  
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