Chanabayaite Explained
| Chanabayaite |
| Category: | Organic mineral |
| Imasymbol: | Cba[1] |
| System: | Orthorhombic |
| Class: | Dipyramidal (mmm)
H-M symbol: (2/m 2/m 2/m) |
| Symmetry: | Imma |
| Unit Cell: | a = 19.48, b = 7.21,
c = 11.999 [Å] (approximated); Z = 4 |
| Color: | Blue |
| Habit: | Prisms (imperfect); radial aggregates |
| Cleavage: | (001), perfect; (100) and (010), imperfect |
| Tenacity: | Brittle |
| Mohs: | 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 .
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.[8] A similar natural phase, formula, likely a precursor of chanabayaite, is described by Zubkova et al. 2016.[9]
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
Notes and References
- Warr. L.N.. 2021. IMA–CNMNC approved mineral symbols. Mineralogical Magazine. 85. 3. 291–320. 10.1180/mgm.2021.43. 2021MinM...85..291W. 235729616. free.
- https://www.mineralienatlas.de/lexikon/index.php/MineralData?mineral=Chanabayaite Mineralienatlas
- 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.
- Web site: Chanabayaite: Chanabayaite mineral information and data . Mindat.org . 2016-03-10.
- Web site: Ammineite: Ammineite mineral information and data . Mindat.org . 2016-03-10.
- Web site: Joanneumite: Joanneumite mineral information and data . Mindat.org . 2016-03-10.
- Web site: Shilovite: Shilovite mineral information and data . Mindat.org . 2016-03-10.
- Web site: Chanabayaite: Chanabayaite mineral information and data . Mindat.org . 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 . Zeitschrift für Kristallographie - Crystalline Materials 231(1), 47–53.
