Paradocrasite
A valid IMA mineral species
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About Paradocrasite
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 Identifiers
Mindat ID:
3087
Long-form identifier:
mindat:1:1:3087:4
GUID
(UUID V4):
(UUID V4):
0745587d-9a8e-4e1c-8011-f9ed84a6b1ae
IMA Classification of Paradocrasite
Approved
First published:
1972
Classification of Paradocrasite
1.CA.15
1 : ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides)
C : Metalloids and Nonmetals
A : Arsenic group elements
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 : 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)
1 : Elements and Alloys (including the arsenides, antimonides and bismuthides of Cu, Ag and Au)
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Pdc | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Paradocrasite
Metallic
Transparency:
Opaque
Colour:
Silver-white
Streak:
Black
Hardness:
3 on Mohs scale
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 Paradocrasite
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;
Oil - pale pink, white, gray with a very faint blue-green tint;
Chemistry of Paradocrasite
Mindat Formula:
Sb2(Sb,As)2
Previously given as Sb3As.
Previously given as Sb3As.
Elements listed:
Crystallography of Paradocrasite
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)°
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 Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
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 Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
High-𝑇 alteration and/or metamorphism | |
33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12]) |
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:
Synonyms of Paradocrasite
Other Language Names for Paradocrasite
German:Paradocrasit
Spanish:Paradocrasita
Common Associates
Associated Minerals Based on Photo Data:
3 photos of Paradocrasite associated with Antimony | Sb |
3 photos of Paradocrasite associated with Cervantite | Sb3+Sb5+O4 |
1 photo of Paradocrasite associated with Garpenbergite | Mn6◻AsSbO10(OH)2 |
1 photo of Paradocrasite associated with Carlfrancisite | Mn2+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 Stibarsen | AsSb |
1 photo of Paradocrasite associated with Jacobsite | Mn2+Fe3+2O4 |
1 photo of Paradocrasite associated with Alleghanyite | Mn2+5(SiO4)2(OH)2 |
1 photo of Paradocrasite associated with Dolomite | CaMg(CO3)2 |
1 photo of Paradocrasite associated with Kutnohorite | CaMn2+(CO3)2 |
Related Minerals - Strunz-mindat Grouping
1.CA.05 | Antimony | Sb |
1.CA.05 | Arsenic | As |
1.CA.05 | Bismuth | Bi |
1.CA.05 | Stibarsen | AsSb |
1.CA.10 | Arsenolamprite | As |
1.CA.10 | Pararsenolamprite | (As,Sb) |
1.CA.20 | Phosphorus | P4 |
Other Information
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 Paradocrasite
mindat.org URL:
https://www.mindat.org/min-3087.html
Please feel free to link to this page.
Please feel free to link to this page.
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External Links:
Mineral Dealers:
References for Paradocrasite
Reference List:
Localities for Paradocrasite
Locality List
- 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.
All localities listed without proper references should be considered as questionable.
Australia (TL) | |
| Leonard et al. (1971) |
L.Lawrence +1 other reference | |
Canada | |
| Identified from the Engineer Mine by Cureton 1996 [Min Rec 27 (1) +1 other reference |
Finland | |
| Hytönen |
Mexico | |
| Mineralogical Society of America - ... |
Anthony et al. (2016) | |
Poland | |
| Geologia Sudetica (1) +7 other references |
Russia | |
| Dvorani (2016) |
Sweden | |
| Holtstam et al. (2022) |
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Moctezuma, Moctezuma Municipality, Sonora, Mexico