Borodaevite
A valid IMA mineral species
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About Borodaevite
Formula:
Ag5(Bi,Pb,Fe)8(Sb,Bi)2S17
Colour:
Black
Lustre:
Metallic
Hardness:
3½
Specific Gravity:
7.90 (Calculated)
Crystal System:
Monoclinic
Name:
Named in honor of Yuri Sergeevich Borodaev (Юрий Сергеевич Бородаев) (1923 - 2017), Russian mineralogist specializing in the mineralogy of ore deposits and professor at the Moscow State University. He discovered 7 new minerals.
Borodaevite is questionable as a pavonite homologue; it may correspond to a homeotypic derivative of treasurite (Ilinca & Makovicky, 1997; Moëlo et al., 2008).
Unique Identifiers
Mindat ID:
728
Long-form identifier:
mindat:1:1:728:5
GUID
(UUID V4):
(UUID V4):
33782b07-435b-4d10-ad49-5c5f7587f8d1
Classification of Borodaevite
Approved
Approval year:
1991
First published:
1992
Type description reference:
2.JA.05g
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
J : Sulfosalts of PbS archetype
A : Galena derivatives with little or no Pb
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
J : Sulfosalts of PbS archetype
A : Galena derivatives with little or no Pb
3.8.10.5
3 : SULFOSALTS
8 : 1 < ø < 2
3 : SULFOSALTS
8 : 1 < ø < 2
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 |
---|---|---|
Bdv | 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 Borodaevite
Metallic
Transparency:
Opaque
Colour:
Black
Streak:
Black
Hardness:
3½ on Mohs scale
Hardness:
VHN20=165 kg/mm2 - Vickers
Density:
7.90 g/cm3 (Calculated)
Optical Data of Borodaevite
Type:
Biaxial
Anisotropism:
Distinct, brown
Bireflectance:
Very weak, only on grain boundaries
Reflectivity:
Wavelength | R1 | R2 |
---|---|---|
420nm | 41.4% | 39.9% |
460nm | 42.1% | 39.8% |
480nm | 42.3% | 39.7% |
520nm | 41.8% | 39.1% |
546nm | 41.4% | 38.8% |
589nm | 40.8% | 37.9% |
620nm | 40.3% | 37.7% |
650nm | 39.8% | 36.9% |
700nm | 39.3% | 36.1% |
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 42.3%.
R1 shown in black, R2 shown in red
Colour in reflected light:
White
Internal Reflections:
None
Pleochroism:
Non-pleochroic
Chemical Properties of Borodaevite
Formula:
Ag5(Bi,Pb,Fe)8(Sb,Bi)2S17
IMA Formula:
Ag4.83Fe0.21Pb0.45(Bi,Sb)8.84S16
Crystallography of Borodaevite
Crystal System:
Monoclinic
Cell Parameters:
a = 13.515(7) Å, b = 4.098(3) Å, c = 26.000(8) Å
β = 93.00(4)°
β = 93.00(4)°
Ratio:
a:b:c = 3.298 : 1 : 6.345
Unit Cell V:
1,438.02 ų (Calculated from Unit Cell)
Z:
2
Comment:
Point Group: 2/m or m.; Space Group: C2/m or Cm.
Crystal Structure
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Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0018804 | Borodaevite | Ilinca G, Makovicky E (1997) Note on the definition of borodayevite [Ag5(Fe,Pb)Bi7]13(Sb,Bi)2S17 Neues Jahrbuch fur Mineralogie, Monatshefte 1997 337-353 | 1997 | Alyaskitovoye ore deposit, Yakutia | 0 | 293 | |
0018805 | Borodaevite | Ilinca G, Makovicky E (1997) Note on the definition of borodayevite [Ag5(Fe,Pb)Bi7]13(Sb,Bi)2S17 and is probably not an good model for borodayevite Neues Jahrbuch fur Mineralogie, Monatshefte 1997 337-353 | 1997 | Alyaskitovoye ore deposit, Yakutia | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
3.49 Å | (80 diffuse) |
3.37 Å | (90 diffuse) |
3.24 Å | (90) |
2.82 Å | (100) |
1.992 Å | (80) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
High-? alteration and/or metamorphism | |
33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12]) |
Type Occurrence of Borodaevite
General Appearance of Type Material:
Elongate, platy crystals, some with an angle of approx 94° between faces, or irregular grains up to 1.2 x 0.5 mm.
Place of Conservation of Type Material:
A. E. Fersman Mineralogical Museum, Moscow, Russia, 87992.
Associated Minerals at Type Locality:
Reference:
Nenasheva, S.N., Efimov, A.V., Sivtzov, A.V., Mozgova, N.N. (1992) Borodaevite [Ag5(Fe,Pb)1Bi7]13(Sb,Bi)2S17 — a new mineral. Zapiski Vserossijskogo Mineralogicheskogo Obshchestva: 121(4): 113-120.
Synonyms of Borodaevite
Other Language Names for Borodaevite
German:Borodaevit
Spanish:Borodaevita
Related Minerals - Strunz-mindat Grouping
2.JA. | Ferdowsiite | Ag8(Sb5As3)S16 |
2.JA. | Sangenaroite | Ag8(Sb8-xAsx)SΣ16 |
2.JA. | Luboržákite | Mn2AsSbS5 |
2.JA.05e | Benjaminite | Ag3Bi7S12 |
2.JA.05a | Cupropavonite | Cu0.9Ag0.5Pb0.6Bi2.5S5 |
2.JA.05i | Livingstonite | HgSb4S6(S2) |
2.JA.05d | Makovickyite | Cu1.12Ag0.81Pb0.27Bi5.35S9 |
2.JA.05f | Mummeite | Cu0.58Ag3.11Pb1.10Bi6.65S13 |
2.JA.05a | Pavonite | AgBi3S5 |
2.JA.05b | Grumiplucite | HgBi2S4 |
2.JA.05h | Mozgovaite | PbBi4S7 |
2.JA.05d | Cupromakovickyite | Cu4AgPb2Bi9S18 |
2.JA.05c | Kudriavite | (Cd,Pb)Bi2S4 |
2.JA.05a | Cupromakopavonite | Ag3Cu8Pb4Bi19S38 |
2.JA.05 | Dantopaite | Ag5Bi13S22 |
2.JA.10a | Cuprobismutite | Cu8AgBi13S24 |
2.JA.10c | Hodrušite | Cu8Bi12S22 |
2.JA.10e | Padĕraite | Cu7[(Cu,Ag)0.33Pb1.33Bi11.33]S22 |
2.JA.10d | Pizgrischite | (Cu,Fe)Cu14PbBi17S35 |
2.JA.10b | Kupčíkite | Cu3.4Fe0.6Bi5S10 |
2.JA.15 | Schapbachite | Ag0.4Pb0.2Bi0.4S |
2.JA.15 | Cuboargyrite | AgSbS2 |
2.JA.20 | Bohdanowiczite | AgBiSe2 |
2.JA.20 | Matildite | AgBiS2 |
2.JA.20 | Volynskite | AgBiTe2 |
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.
Internet Links for Borodaevite
mindat.org URL:
https://www.mindat.org/min-728.html
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References for Borodaevite
Reference List:
Localities for Borodaevite
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.
Russia (TL) | |
| |
Slovakia | |
|
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Alyaskitovoye Sn-W deposit, Ust'-Nera, Indigirka River Basin, Sakha, Russia