Articles | Volume 33, issue 1
Eur. J. Mineral., 33, 9–21, 2021
Eur. J. Mineral., 33, 9–21, 2021

Research article 29 Jan 2021

Research article | 29 Jan 2021

On the anomalous shapes of native copper crystals from the Michigan Copper Country

Jean-Claude Boulliard et al.

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Eur. J. Mineral., 33, 315–328,,, 2021
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Thermodynamic properties, crystal structure and phase relations of pushcharovskite [Cu(AsO3OH)(H2O) ⋅ 0.5H2O], geminite [Cu(AsO3OH)(H2O)] and liroconite [Cu2Al(AsO4)(OH)4 ⋅ 4H2O]
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Cited articles

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Aquilano, D., Bruno, M., and Pastero, L.: Impurity effects on habit change and polymorphic transitions in the system: aragonite-calcite-vaterite, Cryst. Growth Des., 20, 1334–1341,, 2020. 
Baetzold, R. C.: Study of the chemisorption on copper low-index and stepped surfaces, Surf. Sci., 95, 286–298,, 1980. 
Bellman, K., Pohl, U. W., Kuhn C., Wernicke T., and Kneissl, M.: Controlling the morphology transition between step-flow growth and step-bunching growth, J. Cryst. Growth, 478, 187–192,, 2017. 
Böllinghaus, T., Lüders, V., and Nolze, G.: Microstructural insights into natural silver wires, Sci. Rep.-UK, 8, 9053,, 2018. 
Short summary
The anomalous shapes of Michigan copper crystals are well known by mineral collectors and are curated in museums worldwide. Still, their particular habits remain enigmatic. These anomalous crystals do not seem to follow the standard crystal shape theories, maybe due to the presence of oxygen impurities. This new find is of great importance in shape-dependent catalysis, sensor characteristics, or other properties of material such as nanocrystals.