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Ferdowsiite

A valid IMA mineral species
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About FerdowsiiteHide

04837050014946627377583.jpg
Ferdowsi Tousi
Formula:
Ag8(Sb5As3)S16
A Pb-bearing variety was also described (Makovicky et al., 2013).
Colour:
Greyish black
Lustre:
Metallic
Hardness:
2½ - 3
Specific Gravity:
5.3 (Calculated)
Crystal System:
Monoclinic
Name:
The name is for one of the greatest Persian personalities, Ferdowsi Tousi (935–1020), one of the greatest Persian poets to have ever lived. His life-long endeavor to preserve the national identity, language and heritage of his homeland, especially through one of the greatest poetic masterpieces, the Shahnameh, won him lasting fame and honor.
Superstructure of PbS.

Member of the group of ABX2-type sulfosalts of silver, combining antimony and arsenic, with a crystal structure different from other members of this group.

Related to sangenaroite and ~Sb5As3 analogue of the latter.


Unique IdentifiersHide

Mindat ID:
43594
Long-form identifier:
mindat:1:1:43594:7
GUID
(UUID V4):
01a8b78f-51bb-43d6-9447-c1b48539e4ea

IMA Classification of FerdowsiiteHide

Classification of FerdowsiiteHide

2.JA.

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

Mineral SymbolsHide

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

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

Physical Properties of FerdowsiiteHide

Metallic
Transparency:
Opaque
Colour:
Greyish black
Streak:
Dark grey
Hardness:
2½ - 3 on Mohs scale
Comment:
estimated
Tenacity:
Brittle
Cleavage:
None Observed
Parting:
None observed
Fracture:
Irregular/Uneven
Density:
5.3 g/cm3 (Calculated)
Comment:
Could not be measured due to lack of material.

Optical Data of FerdowsiiteHide

Anisotropism:
Distinct in air, and further enhanced in oil. Rotation tints vary between dark brown and bluish grey
Bireflectance:
Distinct
Reflectivity:
WavelengthR1R2
400nm32.3%37.4%
420nm36.1%38.5%
440nm35.7%37.8%
460nm35.1%37.3%
470nm34.9%37.3%
480nm34.9%37.4%
500nm34.3%37.1%
520nm34.1%36.7%
540nm33.5%36.3%
546nm33.4%35.9%
560nm33.3%35.9%
580nm32.4%35.3%
589nm32.4%35.1%
600nm32.3%35.1%
620nm31.8%34.4%
640nm31.0%33.8%
650nm30.7%33.5%
660nm30.4%33.0%
680nm29.8%32.6%
700nm29.2%31.9%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 38.5%.
R1 shown in black, R2 shown in red
Colour in reflected light:
Greyish white
Internal Reflections:
Not observable
Pleochroism:
Visible
Comments:
Distinct, white to grey

Chemistry of FerdowsiiteHide

Mindat Formula:
Ag8(Sb5As3)S16

A Pb-bearing variety was also described (Makovicky et al., 2013).

Crystallography of FerdowsiiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Cell Parameters:
a = 8.677(2) Å, b = 5.799(1) Å, c = 13.839(3) Å
β = 96.175(4)°
Ratio:
a:b:c = 1.496 : 1 : 2.386
Unit Cell V:
692.28 ų
Z:
1
Morphology:
Elongated crystals
Comment:
P21/n

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.225 Å(96)
3.205 Å(100)
2.900 Å(78)
2.750 Å(90)
2.707 Å(73)
1.998 Å(41)
1.979 Å(39)
1.940 Å(22)
Comments:
From Type Description.

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 FerdowsiiteHide

General Appearance of Type Material:
Associated with large corroded crystals of arsenquatrandorite and is partly replaced by guettardite. It also corrodes smithite. Often associated with tetrahedrite/tennantite and forms worm-like symplectites with it.
Place of Conservation of Type Material:
Department of Materials Engineering and Physics, University of Salzburg, Salzburg, Austria, specimen number 15006.
Geological Setting of Type Material:
Volcanogenic massive sulfide deposit of Cretaceous age, situated in the metamorphic Sanandaj-Sirjan Zone. Greenschist metamorphism and deformation in shear zones overprint the original synvolcanic stratiform mineralization.
Associated Minerals at Type Locality:
Reference:
Makovicky, E., Topa, D., Tajeddin, H., Putz, H., Zagler, G. (2013): Ferdowsiite: A new mineral from the Barika Ore Deposit, Iran. The Canadian Mineralogist, 51, 727-734.

Synonyms of FerdowsiiteHide

Varieties of FerdowsiiteHide

Lead-bearing FerdowsiiteA lead-bearing variety of ferdowsiite.

Common AssociatesHide

Associated Minerals Based on Photo Data:
2 photos of Ferdowsiite associated with ProustiteAg3AsS3

Related Minerals - Strunz-mindat GroupingHide

2.JA.SangenaroiteAg8(Sb8-xAsx)SΣ16 Mon. 2/m
2.JA.LuboržákiteMn2AsSbS5Mon. 2/m : B2/m
2.JA.05eBenjaminiteAg3Bi7S12Mon. 2/m : B2/m
2.JA.05gBorodaeviteAg5(Bi,Pb,Fe)8(Sb,Bi)2S17Mon.
2.JA.05aCupropavoniteCu0.9Ag0.5Pb0.6Bi2.5S5 Mon. 2/m : B2/m
2.JA.05iLivingstoniteHgSb4S6(S2)Mon. 2/m : B2/b
2.JA.05dMakovickyiteCu1.12Ag0.81Pb0.27Bi5.35S9Mon. 2/m
2.JA.05fMummeiteCu0.58Ag3.11Pb1.10Bi6.65S13Mon.
2.JA.05aPavoniteAgBi3S5Mon. 2/m : B2/m
2.JA.05bGrumipluciteHgBi2S4Mon. 2/m : B2/m
2.JA.05hMozgovaitePbBi4S7Orth. mmm (2/m 2/m 2/m)
2.JA.05dCupromakovickyiteCu4AgPb2Bi9S18Mon. 2/m : B2/m
2.JA.05cKudriavite(Cd,Pb)Bi2S4Mon. 2/m : B2/m
2.JA.05aCupromakopavoniteAg3Cu8Pb4Bi19S38Mon. 2/m : B2/m
2.JA.05DantopaiteAg5Bi13S22Mon. 2/m : B2/m
2.JA.05SelenodantopaiteAg5Bi13Se22Mon. 2/m : B2/m
2.JA.10aCuprobismutiteCu8AgBi13S24Mon. 2/m : B2/m
2.JA.10cHodrušiteCu8Bi12S22Mon. 2/m
2.JA.10ePadĕraiteCu7[(Cu,Ag)0.33Pb1.33Bi11.33]S22Mon. 2/m : P21/m
2.JA.10dPizgrischite(Cu,Fe)Cu14PbBi17S35Mon. 2/m : B2/m
2.JA.10bKupčíkiteCu3.4Fe0.6Bi5S10Mon. 2/m : B2/m
2.JA.15SchapbachiteAg0.4Pb0.2Bi0.4SIso. m3m (4/m 3 2/m) : Fm3m
2.JA.15CuboargyriteAgSbS2Iso. m3m (4/m 3 2/m)
2.JA.20BohdanowicziteAgBiSe2Trig. 3m (3 2/m) : P3m1
2.JA.20MatilditeAgBiS2Trig. 3 2 : P31 2 1
2.JA.20VolynskiteAgBiTe2Trig. 3m (3 2/m) : P3m1

Other InformationHide

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 FerdowsiiteHide

References for FerdowsiiteHide

Localities for FerdowsiiteHide

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.
Iran (TL)
 
  • West Azerbaijan Province
    • Sardasht County
      • Sardasht
Williams et al. (2013) +1 other reference
Italy
 
  • Tuscany
    • Lucca Province
      • Stazzema
        • Sant'Anna di Stazzema
Biagioni et al. (2017)
Peru
 
  • Lima
    • Oyón Province
      • Oyón District
In the collection of Brent Thorne. ...
Spain
 
  • Andalusia
    • Almería
      • Pechina
        • Baños de Alhamilla
Rewitzer et al. (part2)
 
Mineral and/or Locality  
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