Chanabayaite
| Chanabayaite | |
|---|---|
 | |
| General | |
| Category | Organic mineral |
| Formula (repeating unit) | Cu 2(N 3C 2H 2Cl(NH 3,Cl,H 2O,[]) 4 |
| IMA symbol | Cba[1] |
| Crystal system | Orthorhombic |
| Crystal class | Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m) |
| Space group | Imma |
| Unit cell | a = 19.48, b = 7.21, c = 11.999 [Å] (approximated); Z = 4 |
| 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 | [2][3][4] |
Chanabayaite is the first recognized triazolate mineral, having the formula Cu
2(N
3C
2H
2Cl(NH
3,Cl,H
2O,[])
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
[edit]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
[edit]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
[edit]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
[edit]- ^ 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.
- ^ Mineralienatlas
- ^ a b c d e 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.
- ^ a b "Chanabayaite: Chanabayaite mineral information and data". Mindat.org. Retrieved 2016-03-10.
- ^ "Ammineite: Ammineite mineral information and data". Mindat.org. Retrieved 2016-03-10.
- ^ "Joanneumite: Joanneumite mineral information and data". Mindat.org. Retrieved 2016-03-10.
- ^ "Shilovite: Shilovite mineral information and data". Mindat.org. Retrieved 2016-03-10.
- ^ Zubkova, N.V., Chukanov, N.V., Pekov, I., and Pushcharovsky, D., 2016. The crystal structure of the natural 1,2,4-triazolate compound NaCu
2Cl
3[N
3C
2H
2]
2[NH
3]
2•4H
2O. Zeitschrift für Kristallographie - Crystalline Materials 231(1), 47–53.