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About AvdoniniteHide

K2Cu5(OH)4Cl8 · H2O
Specific Gravity:
Crystal System:
Named in honor of Vladimir Nikolayevich Avdonin (Владимира Николаевича Авдонина) (10 July 1925, Republic of Mordovia, USSR - ) of the Urals State Mining Academy.
A fumarole mineral. Also known as an anthropogenic product, forming pseudomorphs after steel (?) objects and oval flattened accumulations (Bushmakin et al., 1998).
Related to the synthetic phase K2Cu5Cl8(OH)4.2H2O (Kahlenberg, 2004).

Classification of AvdoniniteHide

Approval Year:

D : Oxyhalides, hydroxyhalides and related double halides
A : With Cu, etc., without Pb

Physical Properties of AvdoniniteHide

Pale green
on {100}
3.03 g/cm3 (Measured)    3.066 g/cm3 (Calculated)

Optical Data of AvdoniniteHide

RI values:
nα = 1.669 nβ = 1.688 nγ = 1.707
Measured: 90°
Max Birefringence:
δ = 0.038
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:

Chemical Properties of AvdoniniteHide

K2Cu5(OH)4Cl8 · H2O
IMA Formula:
K2Cu5Cl8(OH)4 · 2H2O

Crystallography of AvdoniniteHide

Crystal System:
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 24.34 Å, b = 5.878 Å, c = 11.626 Å
β = 93.3°
a:b:c = 4.141 : 1 : 1.978
Unit Cell V:
1660.6 ų
short-prismatic to thick tabular crystals
Space group P2/m, Pm or P2

X-Ray Powder DiffractionHide

Powder Diffraction Data:
11.63 (100)
5.80 (27)
5.88 (20)
2.518 (19)
5.73 (7)
2.321 (17)

Type Occurrence of AvdoniniteHide

General Appearance of Type Material:
Imperfect, short-prismatic, partly flattened crystals up to 0.2 mm in length in aggregates, and in pseudomorphs after melanothallite
Geological Setting of Type Material:
Volcanic fumarole
Associated Minerals at Type Locality:

Synonyms of AvdoniniteHide

Other Language Names for AvdoniniteHide


Common AssociatesHide

Associated Minerals Based on Photo Data:
Chrysothallite5 photos of Avdoninite associated with Chrysothallite on mindat.org.
Belloite4 photos of Avdoninite associated with Belloite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

3.DA.CentennialiteCaCu3Cl2(OH)6 · nH2O (n ~ 0.7)Trig. 3m (3 2/m) : P3m1
3.DA.10aAtacamiteCu2(OH)3ClOrth. mmm (2/m 2/m 2/m) : Pnma
3.DA.10bBotallackiteCu2(OH)3ClMon. 2/m : P21/m
3.DA.10bClinoatacamiteCu2(OH)3ClMon. 2/m
3.DA.10aKempiteMn2+2(OH)3ClOrth. mmm (2/m 2/m 2/m) : Pnma
3.DA.10cParatacamiteCu3(Cu,Zn)(OH)6Cl2Trig. 3m (3 2/m)
3.DA.10bBelloiteCu(OH)ClMon. 2/m : P21/b
3.DA.10cHerbertsmithiteCu3Zn(OH)6Cl2Trig. 3m (3 2/m) : R3m
3.DA.10cKapellasiteCu3Zn(OH)6Cl2Trig. 3m (3 2/m) : P3m1
3.DA.10cGillarditeCu3Ni(OH)6Cl2Trig. 3m (3 2/m) : R3m
3.DA.10cHaydeeiteCu3Mg(OH)6Cl2Trig. 3m (3 2/m) : P3m1
3.DA.15ClaringbulliteCu4ClF(OH)6Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
3.DA.15BarlowiteCu4BrF(OH)6Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
3.DA.20SimonkolleiteZn5Cl2(OH)8 · H2OTrig. 3m (3 2/m) : P3m1
3.DA.25ButtgenbachiteCu19(NO3)2(OH)32Cl4 · 2H2OHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
3.DA.25ConnelliteCu19(SO4)(OH)32Cl4 · 3H2OHex. 6 m2 : P62c
3.DA.40AnthonyiteCu(OH,Cl)2 · 3H2OMon. 2/m
3.DA.40CalumetiteCu(OH,Cl)2 · 2H2OOrth.
3.DA.45KhaidarkaniteNa0.34Cu4Al3(OH)14F3 · 2H2OMon.
3.DA.50BobkingiteCu5Cl2(OH)8 · 2H2OMon. 2/m : B2/m
3.DA.60DroninoiteNi6Fe2+3(OH)16Cl2 · 4H2OTrig. 3m (3 2/m) : R3m

Other InformationHide

It slowly decomposes in cold water and dissolves in dilute HCl with no evolved gases.
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 AvdoniniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Bushmakin, A.F., Bazhenova, L.F. (1998) Avdoninite, new mineral from technogene zone of Urals pyrite deposits. In: Ural'skiy mineralogicheskiy sbornik, N8 (Urals mineralogical collection, N 8), Rossiyskaya Akademiya Nauk, Ural'skoye Otdeleniye, Institut Mineralogii. Miass, Russian Federation, pp. 32-39.
Kahlenberg, V. (2004) On the crystal structure of K2Cu5Cl8(OH)4.2H2O. Zeitschrift für Anorganische und Allgemeine Chemie: 630: 900-903.
Chukanov, N.V., Murashko, M.N., Zadov, A.E., Bushmakin, A.F. (2006) Avdoninite, K2Cu5Cl8(OH)4•H2O, a new mineral from volcanic exhalations and from the zone of technogenesis at massive sulphide ore deposits. Proceedings of the Russian Mineralogical Society: 135(3): 38–42.
Pekov, I.V. (2007) New minerals from former Soviet Union countries, 1998-2006: new minerals approved by the IMA commission on new minerals and mineral names. Mineralogical Almanac: 11: 9-51.
Ercit, T.S., Piilonen, P.C., Poirier, G., Tait, K.T. (2009) New mineral names. American Mineralogist: 94: 1075-1083.
Pekov, I.V., Krivovichev, S.V., Chukanov, N.V., Yapaskurt, V.O., Sidorov, E.G. (2015) Avdoninite: new data, crystal structure and refined formula K2Cu5Cl8(OH)4·2H2O. Zapiski Rossiiskogo Mineralogicheskogo Obshchetstva: 144(3): 55-69.

Internet Links for AvdoniniteHide

Localities for AvdoniniteHide

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.
  • Saxony-Anhalt
    • Stassfurt Potash Deposit
      • Bernburg
Witzke, T. (2012): Gillardit, Cu3Ni(OH)6Cl2, und Avdoninit, K2Cu5Cl8(OH)4 • H2O, zwei Neufunde von Bernburg, Sachsen-Anhalt. Aufschluss 63, 209-211.
  • Kamchatka Krai
    • Tolbachik volcano
      • Great Fissure eruption (Main Fracture)
        • Northern Breakthrough (North Breach)
Pekov, I. V., Zubkova, N. V., Zelenski, M. E., Yapaskurt, V. O., Polekhovsky, Y. S., Fadeeva, O. A., & Pushcharovsky, D. Y. (2013). Yaroshevskite, Cu9O2 (VO4) 4Cl2, a new mineral from the Tolbachik volcano, Kamchatka, Russia. Mineralogical Magazine, 77(1), 107-116.
Pekov, I.V., Zubkova, N.V., Yapaskurt, V.O., Lykova, I.S., Belakovskiy, D.I., Vigasina, M.F., Sidorov, E.G., Britvin, S.N., Pushscharovsky, D.Yu. (2015): New zinc and potassium chlorides from fumaroles of the Tolbachik volcano, Kamchatka, Russia: mineral data and crystal chemistry. I. Mellizinkalite, K3Zn2Cl7. European Journal of Mineralogy, 27, 247-253.
N. V. Chukanov, M. N. Murashko, A. E. Zadov & A. F. Bushmakin (2006): Avdoninite, K2Cu5Cl8(OH)4• H2O, a new mineral from volcanic exhalations and from the zone of technogenesis at massive sulphide ore deposits. Proceedings of the Russian Mineralogical Society 135(3), 38–42
  • Orenburg Oblast
    • Mednogorsk District
      • Sakmara Zone
Rossiyskaya Akademiya Nauk, Ural'skoye Otdeleniye, Institut Mineralogii. Miass, Russian Federation 1998, 32-39.
  • Sverdlovsk Oblast
Am Min 2009 p1076
Mineral and/or Locality  
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