Quatrandorite

AgPbSb3S6
IMA status
  • Approved
  • Grandfathered
IMA symbol
Ado IV
Also known as
  • Quatrandoriet

Where it forms, where it's found

Geological setting

subvolcanic hydrothermal Ag-Sn-bearing veins

Type locality
Les Cougnasses mine
  1. Orpierre
  2. Gap
  3. Hautes-Alpes
  4. Provence-Alpes-Côte d'Azur
  5. France

44.3251°, 5.7334°

13recorded occurrences
Source · OpenStreetMap

Safety & handling

Physical

Transparency
Opaque
Colour
grey
Streak
black

Optical

UV response
none
Notes

(optical properties similar to ramdohrite)

Crystallography

Crystal system
Monoclinic
Space group
P1 21/c 1
Cell parameters
a = 19.1686(19) Å · b = 17.160(3) Å · c = 13.042(2) Å
Cell angles
β = 90.008(12) °
Ratio a:b:c
1 : 0.895 : 0.680
Z
1
Twinning

Practically always twinned, polysynthetic (Moëlo et al. 1984).

Comment

Cell from Nespolo et al. (2012). Strongly pseudo-orthorhombic (Cmcm aristotype). Previously assumed cell (non-centrosymmetric space group P2): a = 13.04, b = 17.07, c = 10.18 Å, β = 90°.

Crystal structure

Chemical composition

Constituent elements
Mass composition breakdown
ElementAtoms At. mass g/mol Mass g/molMass share
51SbAntimonyAntimony3121.760365.280
41.86%
82PbLeadLead1207.200207.200
23.74%
16SSulfurSulfur632.060192.360
22.04%
47AgSilverSilver1107.868107.868
12.36%
Total872.708100.00%

Mass share = atoms × atomic mass ÷ molar mass × 100

From IMA formula

Impurities
  • Bi
  • Cu

Synonyms

  • Quatrandoriet

In other languages

French
Andorite IV · Quatrandorite
German
Andorit IV · Quatrandorit
Italian
andorite IV

Classification

Strunz
10th ed.

2.JB.40a

  • 2Sulfides and SulfosaltsClass
  • 2.JSulfosalts of PbS archetypeDivision
  • 2.JBGalena derivatives, with PbGroup
  • 2.JB.40aQuatrandoriteSpecies

Group, growth & confusion

In the same group
30 members

Literature, links & citation

Citations
  1. 1954Donnay, J. D. H., Donnay, Gabrielle (1954) Syntaxic intergrowths in the andorite series. American Mineralogist, 39 (3-4) 161-171
  2. 1984Moëlo, Y., Makovicky, E., Karup-Møller, S. (1984) New data on the minerals of the andorite series. Neues Jahrbuch für Mineralogie - Monatshefte, 1984. 175-182
  3. 1985Dunn, Pete J., Chao, George Y., Fleischer, Michael, Ferraiolo, James A., Langley, Richard H., Pabst, Adolf, Zilczer, Janet A. (1985) New mineral names. American Mineralogist, 70 (1-2) 214-221
  4. 1996Paar, W., Brodtkorb, M.K.de, Topa, D., Sureda, R.J., (1996) Caracterizacion mineralogica y quimica de algunas especies metaliferas del yacimiento Pirquitas, provincia de Jujuy, Republica Argentina. Part 1. 3rd Congreso Geologico Argentino & 3rd Congreso de Exploracion de Hidrocarburos: 3: 141-158.
  5. 2012NESPOLO, Massimo, OZAWA, Tohru, KAWASAKI, Yusuke, SUGIYAMA, Kazumasa (2012) Structural relations and pseudosymmetries in the andorite homologous series. Journal of Mineralogical and Petrological Sciences, 107 (6) 226-243 doi:10.2465/jmps.120730 DOI: 10.2465/jmps.120730
Cite this entry
@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Quatrandorite — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/quatrandorite-11345},
  note      = {Accessed 2026-05-11}
}