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Avdoninite

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Blyava Cu deposit, Sakmara Zone, Mednogorsk District, Orenburgskaya Oblast', Southern Urals, Urals Region, Russia
© Brent Thorne

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Formula:
K
 
2
Cu
 
5
(OH)
 
4
Cl
 
8
 · H
 
2
O
System:MonoclinicColour:Green
Hardness:3
Name:For mineralogist V. N. Avdonin (b. 1925) 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 Avdoninite

IMA status:Approved 2005
Strunz 8th edition ID:3/D.02-20
Nickel-Strunz 10th (pending) edition ID:3.DA.55

3 : HALIDES
D : Oxyhalides, hydroxyhalides and related double halides
A : With Cu, etc., without Pb
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Type Occurrence of Avdoninite

Type Locality:Yadovitaya fumarole, Second scoria cone, Northern Breakthrough (North Breach), Great Fissure (Main Fracture) eruption, Tolbachik volcano, Kamchatka Oblast', Far-Eastern Region, Russia
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:
ParatacamiteLangbeiniteEuchlorineBelloiteAtacamite

Physical Properties of Avdoninite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent
Colour:Green
Streak:Pale green
Hardness (Mohs):3
Tenacity:Brittle
Cleavage:Perfect
on {100}
Fracture:Step-Like
Density (measured):3.03 g/cm3
Density (calculated):3.066 g/cm3

Crystallography of Avdoninite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Cell Parameters:a = 24.34Å, b = 5.878Å, c = 11.626Å
β = 93.3°
Ratio:a:b:c = 4.141 : 1 : 1.978
Unit Cell Volume:V 1660.6 ų
Z:4
Morphology:short-prismatic to thick tabular crystals
Comment:Space group P2/m, Pm or P2
X-Ray Powder Diffraction:
d-spacingIntensity
11.63 (100)
5.80 (27)
5.88 (20)
2.518 (19)
5.73 (7)
2.321 (17)

Optical Data of Avdoninite

Type:Biaxial
RI values: nα = 1.669 nβ = 1.688 nγ = 1.707
2V:Measured: 90°
Maximum Birefringence:δ = 0.038

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:High

Chemical Properties of Avdoninite

Formula:
K
 
2
Cu
 
5
(OH)
 
4
Cl
 
8
 · H
 
2
O
Essential elements:Cl, Cu, H, K, O
All elements listed in formula:Cl, Cu, H, K, O
Analytical Data:Results from electron probe microanalysis (EPMA):
K2O (11.94)
CuO (51.43)
Cl (37.07)
H2O (6.9)

less O = Cl (8.37)

sum: 98.97 wt.-%

Relationship of Avdoninite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
3.DA.05Melanothallite
Cu
 
2
Cl
 
2
O
3.DA.10aAtacamite
Cu
 
2
(OH)
 
3
Cl
3.DA.10bBotallackite
Cu
 
2
(OH)
 
3
Cl
3.DA.10bClinoatacamite
Cu
 
2
(OH)
 
3
Cl
3.DA.10aHibbingite
Fe
2+
2
(OH)
 
3
Cl
3.DA.10aKempite
Mn
2+
2
(OH)
 
3
Cl
3.DA.10cParatacamite
Cu
 
3
(Cu,Zn)(OH)
 
6
Cl
 
2
3.DA.10bBelloite
Cu(OH)Cl
3.DA.10cHerbertsmithite
Cu
 
3
Zn(OH)
 
6
Cl
 
2
3.DA.10cKapellasite
Cu
 
3
Zn(OH)
 
6
Cl
 
2
3.DA.10cGillardite
Cu
 
3
Ni(OH)
 
6
Cl
 
2
3.DA.10cHaydeeite
Cu
 
3
Mg(OH)
 
6
Cl
 
2
3.DA.10dAnatacamite
Cu
 
2
Cl(OH)
 
3
3.DA.15Claringbullite
Cu
 
4
(OH)
 
7
Cl · nH
 
2
O
3.DA.15Barlowite
Cu
 
4
BrF(OH)
 
6
3.DA.20Simonkolleite
Zn
 
5
Cl
 
2
(OH)
 
8
 · H
 
2
O
3.DA.25Buttgenbachite
Cu
 
19
(NO
 
3
)
 
2
(OH)
 
32
Cl
 
4
 · 2H
 
2
O
3.DA.25Connellite
Cu
 
19
(SO
 
4
)(OH)
 
32
Cl
 
4
 · 3H
 
2
O
3.DA.30Abhurite
Sn
 
21
Cl
 
16
(OH)
 
14
O
 
6
3.DA.35Ponomarevite
K
 
4
Cu
 
4
Cl
 
10
O
3.DA.40Anthonyite
Cu(OH,Cl)
 
2
 · 3H
 
2
O
3.DA.40Calumetite
Cu(OH,Cl)
 
2
 · 2H
 
2
O
3.DA.45Khaidarkanite
Na
 
0.34
Cu
 
4
Al
 
3
(OH)
 
14
F
 
3
 · 2H
 
2
O
3.DA.50Bobkingite
Cu
 
5
Cl
 
2
(OH)
 
8
 · 2H
 
2
O
3.DA.60Droninoite
Ni
 
3
Fe
3+
 
Cl(OH)
 
8
 · 2H
 
2
O

Other Names for Avdoninite

Synonyms:
IMA2005-046a
Other Languages:
German:Avdoninit

Other Information

Other Information:It slowly decomposes in cold water and dissolves in dilute HCl with no evolved gases.
Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Avdoninite

Reference List:

- +
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.

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. [American Mineralogist 94,1076(2009)(abstract)]

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    • Localities for Avdoninite

    The 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.
    Hide Locality List
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Russia
     
    • Far-Eastern Region
      • Kamchatka Oblast'
        • Tolbachik volcano
          • Great Fissure (Main Fracture) eruption
            • Northern Breakthrough (North Breach)
              • Second scoria cone
    		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
    • Urals Region
      • Middle Urals
        • Ekaterinburgskaya (Sverdlovskaya) Oblast'
    		Am Min 2009 p1076
      • Southern Urals
        • Orenburgskaya Oblast'
          • Mednogorsk District
            • Sakmara Zone
    		Rossiyskaya Akademiya Nauk, Ural'skoye Otdeleniye, Institut Mineralogii. Miass, Russian Federation 1998, 32-39.
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