Chanabayaite

Chanabayaite is the first recognized triazolate mineral, having the formula Cu
2(N
3C
2H
2Cl(NH
3,Cl,H
2O,[])
4.

Chanabayaite
General
CategoryOrganic mineral
Formula
(repeating unit)		Cu
2(N
3C
2H
2Cl(NH
3,Cl,H
2O,[])
4
IMA symbolCba[1]
Crystal systemOrthorhombic
Crystal classDipyramidal (mmm)
H-M symbol: (2/m 2/m 2/m)
Space groupImma
Unit cella = 19.48, b = 7.21,
c = 11.999 [Å] (approximated); Z = 4
Identification
ColorBlue
Crystal habitPrisms (imperfect); radial aggregates
Cleavage(001), perfect; (100) and (010), imperfect
TenacityBrittle
Mohs scale hardness2
Density1.48 (measured)
PleochroismDeep blue to pale blue with gray hue (strong)
References[2][3][4]

Minor iron admixture is also present.[3] It is also one of a few currently known minerals containing ammine groups, including also ammineite, joanneumite and shilovite.[5][6][7] All the minerals are rare and were found in a single guano deposit in Chile, called Pabellón de Pica.[4] A similar natural phase, formula NaCu
2Cl
3[N
3C
2H
2]
2[NH
3]
2•4H
2O, likely a precursor of chanabayaite, is described by Zubkova et al. 2016.[8]

Crystal structure

The main features of the crystal structure of chanabayaite are:[3]

  • copper forms octahedra, part of which share corners
  • 1,2,4-triazolate anions link the octahedra

Association

Chanabayaite coexists with halite, joanneumite, nitratine, salammoniac and paragenetically-unrelated chalcopyrite. Chalcopyrite is present in an amphibole- and plagioclase-bearing gabbro, that contacts the guano deposit.[3]

Formation

Three suggested processes account for the formation of chanabayaite:[3]

  • leaching of sodium from the precursor phase
  • leaching of chlorine from the precursor phase
  • partial dehydratation of the precursor phase

References
  1. Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  2. Mineralienatlas
  3. Chukanov, N.V., Zubkova, N.V., Möhn, G., Pekov, I.V., Pushcharovsky, D.Yu., and Zadov, A.E., 2015. Chanabayaite, Cu2(N3C2H2Cl(NH3,Cl,H2O,[])4, a new mineral containing triazolate anion. Geology of Ore Deposits 57(8), 712-720.
  4. "Chanabayaite: Chanabayaite mineral information and data". Mindat.org. Retrieved 2016-03-10.
  5. "Ammineite: Ammineite mineral information and data". Mindat.org. Retrieved 2016-03-10.
  6. "Joanneumite: Joanneumite mineral information and data". Mindat.org. Retrieved 2016-03-10.
  7. "Shilovite: Shilovite mineral information and data". Mindat.org. Retrieved 2016-03-10.
  8. Zubkova, N.V., Chukanov, N.V., Pekov, I., and Pushcharovsky, D., 2016. The crystal structure of the natural 1,2,4-triazolate compound NaCu
    2    Cl
    3    [N
    3    C
    2    H
    2    ]
    2    [NH
    3    ]
    2    •4H
    2    O    . Zeitschrift für Kristallographie - Crystalline Materials 231(1), 47–53.
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