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Ferdowsiite

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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.


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Classification of FerdowsiiteHide

Approved

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)

Optical Data of FerdowsiiteHide

Type:
Anisotropic
Anisotropism:
Rotation tints vary between dark brown and bluish grey
Bireflectance:
Distinct
Colour in reflected light:
Greyish white
Internal Reflections:
Not observable
Pleochroism:
Visible
Comments:
Distinct, white to grey

Chemical Properties of FerdowsiiteHide

Formula:
Ag8(Sb5As3)S16

A Pb-bearing variety was also described (Makovicky et al., 2013).
IMA Formula:
Ag8(Sb5As3)S16

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(96)
3.205(100)
2.900(78)
2.750(90)
2.707(73)
1.998(41)
1.979(39)
1.940(22)
Comments:
From Type Description.

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:

Synonyms of FerdowsiiteHide

Other Language Names for FerdowsiiteHide

Varieties of FerdowsiiteHide

Plumbian FerdowsiiteA lead-bearing variety of Ferdowsiite.

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.

References for FerdowsiiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Topa, D., Makovicky, E., Putz, H., Zagler, G. and Tajjedin, H. (2013) Ferdowsiite, IMA 2012-062. CNMNC Newsletter No. 15, February 2013, page 9; Mineralogical Magazine, 77, 1-12.
Makovicky, E., Topa, D., Tajeddin, H., Putz, H., Zagler, G. (2013): Ferdowsiite: A new mineral from the Barika Ore Deposit, Iran. Canadian Mineralogist, 51, 727-734.

Internet Links 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 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.
Iran (TL)
 
  • West Azarbaijan Province (West Azerbaijan Province)
    • Sardasht County
      • Sardasht
Topa, D., Makovicky, E., Putz, H., Zagler, G. and Tajjedin, H. (2013) Ferdowsiite, IMA 2012-062. CNMNC Newsletter No. 15, February 2013, page 9; Mineralogical Magazine, 77, 1-12; Makovicky, E., Topa, D., Tajeddin, H., Putz, H., Zagler, G. (2013): Ferdowsiite: A new mineral from the Barika Ore Deposit, Iran. Canadian Mineralogist, 51, 727-734.
Peru
 
  • Lima Department
    • Oyon Province
In the collection of Brent Thorne. Acquired from Jaroslav Hyrsl. Analyzed by Frank Keutsch.
Mineral and/or Locality  
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