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Paradocrasite

A valid IMA mineral species
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About ParadocrasiteHide

Formula:
Sb2(Sb,As)2
Previously given as 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"
A very rare, natural Sb-rich alloy.


Unique IdentifiersHide

Mindat ID:
3087
Long-form identifier:
mindat:1:1:3087:4
GUID
(UUID V4):
0745587d-9a8e-4e1c-8011-f9ed84a6b1ae

IMA Classification of ParadocrasiteHide

Approved
First published:
1972

Classification of ParadocrasiteHide

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)

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
PdcIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

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

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;

Chemistry of ParadocrasiteHide

Mindat Formula:
Sb2(Sb,As)2

Previously given as Sb3As.

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

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.06 Å(100)
2.09 Å(70)
2.21 Å(60)
3.72 Å(40)
1.730 Å(40)
1.521 Å(40)
1.392 Å(40)
Comments:
Broken Hill, Australia.

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
High-𝑇 alteration and/or metamorphism
33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12])

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

Common AssociatesHide

Associated Minerals Based on Photo Data:
3 photos of Paradocrasite associated with AntimonySb
3 photos of Paradocrasite associated with CervantiteSb3+Sb5+O4
1 photo of Paradocrasite associated with GarpenbergiteMn6◻AsSbO10(OH)2
1 photo of Paradocrasite associated with CarlfrancisiteMn2+3(Mn2+,Mg,Fe3+,Al)42[As3+O3]2(As5+O4)4[(Si,As5+)O4]6[(As5+,Si)O4]2(OH)42
1 photo of Paradocrasite associated with StibarsenAsSb
1 photo of Paradocrasite associated with JacobsiteMn2+Fe3+2O4
1 photo of Paradocrasite associated with AlleghanyiteMn2+5(SiO4)2(OH)2
1 photo of Paradocrasite associated with DolomiteCaMg(CO3)2
1 photo of Paradocrasite associated with KutnohoriteCaMn2+(CO3)2

Related Minerals - Strunz-mindat 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
1.CA.20PhosphorusP4Iso. 4 3m : I4 3m

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.

Internet Links for ParadocrasiteHide

References for ParadocrasiteHide

Localities for ParadocrasiteHide

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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Australia (TL)
 
  • New South Wales
    • Yancowinna Co.
      • Broken Hill district
Leonard et al. (1971)
L.Lawrence +1 other reference
Canada
 
  • British Columbia
    • Atlin Mining Division
      • Tagish Lake
Identified from the Engineer Mine by Cureton 1996 [Min Rec 27 (1) +1 other reference
Finland
 
  • South Ostrobothnia
    • Seinäjoki
Hytönen
Mexico
 
  • Sonora
    • Moctezuma Municipality
      • Moctezuma
Mineralogical Society of America - ...
Anthony et al. (2016)
Poland
 
  • Lower Silesian Voivodeship
    • Ząbkowice Śląskie County
      • Gmina Ząbkowice Śląskie
        • Szklary
Geologia Sudetica (1) +7 other references
Russia
 
  • Krasnoyarsk Krai
    • Maimecha and Kotui Rivers Basin
Dvorani (2016)
Sweden
 
  • Dalarna County
    • Hedemora
      • Garpenberg
Holtstam et al. (2022)
 
Mineral and/or Locality  
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