Chanabayaite

Chanabayaite
General
Category Organic mineral
Formula
(repeating unit)
Cu2(N3C2H2Cl(NH3,Cl,H2O,[])4
Crystal system Orthorhombic
Space group Orthorhombic - Dipyramidal (mmm)
Unit cell a=19.48, b=7.21, c=11.999 (approximated)
Identification
Color Blue
Crystal habit Prisms (imperfect); radial aggregates
Cleavage (001), perfect; (100) and (010), imperfect
Tenacity Brittle
Mohs scale hardness 2
Density 1.48 (measured)
Pleochroism Deep blue to pale blue with gray hue (strong)
References [1][2]

Chanabayaite is the first recognized triazolate mineral, having the following formula: Cu2(N3C2H2Cl(NH3,Cl,H2O,[])4. Minor iron admixture is also present.[1] It is also one of a few currently known minerals containing ammine groups, including also ammineite, joanneumite and shilovite.[3][4][5] All the minerals are rare and were found in a single guano deposit in Chile, called Pabellón de Pica.[2] A similar natural phase, formula NaCu2Cl3[N3C2H2]2[NH3]2·4H2O, likely a precursor of chanabayaite, is described by Zubkova et al. 2016.[6]

Crystal structure

The main features of the crystal structure of chanabayaite are:[1]

Association

Chanabayaite coexists with halite, joanneumite, nitratine, salammoniac and paragenetically-unrelated chalcopyrite. Chalcopyrite is present in an amphibole- and plagioclase-bearing gabbro, that conctacts the guano deposit.[1]

Formation

Three suggested processes account for the formation of chanabayaite:[1]

References

  1. 1 2 3 4 5 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.
  2. 1 2 "Chanabayaite: Chanabayaite mineral information and data". Mindat.org. Retrieved 2016-03-10.
  3. "Ammineite: Ammineite mineral information and data". Mindat.org. Retrieved 2016-03-10.
  4. "Joanneumite: Joanneumite mineral information and data". Mindat.org. Retrieved 2016-03-10.
  5. "Shilovite: Shilovite mineral information and data". Mindat.org. Retrieved 2016-03-10.
  6. Zubkova, N.V., Chukanov, N.V., Pekov, I., and Pushcharovsky, D., 2016. The crystal structure of the natural 1,2,4-triazolate compound NaCu2Cl3[N3C2H2]2[NH3]2·4H2O. Zeitschrift für Kristallographie - Crystalline Materials 231(1), 47–53.
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