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Color effects of Cu nanoparticles in Cu-bearing plagioclase feldspars

  • Shiyun Jin , Ziyin Sun and Aaron C. Palke
Published/Copyright: December 1, 2022
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American Mineralogist
From the journal American Mineralogist Volume 107 Issue 12

Abstract

The optical properties (scattering, absorption, and extinction) of spheroidal Cu particles embedded in intermediate plagioclase feldspar are computed for various sizes and shapes using the Mie theory and T-matrix method. The observed color for Cu-bearing plagioclase, as a function of particle size and shape, is also calculated from the computed extinction spectra. The colors and pleochroism observed in natural and treated Cu-bearing plagioclase can be explained from the computational results. The enigmatic green colors in some precious Oregon sunstones result from red light being scattered away by Cu nanoparticles of certain sizes. The UV-VIS spectra are collected on Cu-bearing plagioclase samples for comparison with the computational results, which are shown to match the optical observations. The results from this work may be used to quantify the concentration of colloidal Cu in plagioclase or glass with a similar refractive index. Particle sizes and shapes can also be characterized using extinction and scattering spectra, which can be collected with different optical configurations. New materials with special color effects and optical characteristics may be designed and engineered by applying the unusual properties of metal colloids.

Keywords: Oregon sunstone; Cu nanoparticle; pleochroism; absorption; scattering; extinction

Acknowledgments and Funding

The authors thank Shane F. McClure for providing the natural Oregon sunstone sample, and Philip Laven for patient explanations on the different functions and outputs of the MiePlot program. We thank Anne Hofmeister and George Rossman for many constructive comments, and Associate Editor Simon Redfern for handling the manuscript. This research is supported by the Richard T. Liddicoat Postdoctoral Research Associate Fellowship program at GIA.

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Received: 2021-09-30
Accepted: 2021-12-21
Published Online: 2022-12-01
Published in Print: 2022-12-16

© 2022 Mineralogical Society of America

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https://doi.org/10.2138/am-2022-8325
Keywords for this article
Oregon sunstone; Cu nanoparticle; pleochroism; absorption; scattering; extinction

Articles in the same Issue

  1. Oxidation of arcs and mantle wedges: It’s not all about iron and water
  2. Paragenesis of Li minerals in the Nanyangshan rare-metal pegmatite, Northern China: Toward a generalized sequence of Li crystallization in Li-Cs-Ta-type granitic pegmatites
  3. The new mineral tomiolloite, Al12(Te4+O3)5[(SO3)0.5(SO4)0.5](OH)24: A unique microporous tellurite structure
  4. Authigenic anatase nanoparticles as a proxy for sedimentary environment and porewater pH
  5. Color effects of Cu nanoparticles in Cu-bearing plagioclase feldspars
  6. Expanding the speciation of terrestrial molybdenum: Discovery of polekhovskyite, MoNiP2, and insights into the sources of Mo-phosphides in the Dead Sea Transform area
  7. Sound speed and refractive index of amorphous CaSiO3 upon pressure cycling to 40 GPa
  8. Calorimetric study of skutterudite (CoAs2.92) and heazlewoodite (Ni3S2)
  9. Melting phase equilibrium relations in the MgSiO3-SiO2 system under high pressures
  10. Effects of hydrostaticity and Mn-substitution on dolomite stability at high pressure
  11. Crystallization of bastnäsite and burbankite from carbonatite melt in the system La(CO3)F-CaCO3-Na2CO3 at 100 MPa
  12. Crystal shapes, triglyphs, and twins in minerals: The case of pyrite
  13. Nanostructure reveals REE mineral crystallization mechanisms in granites from a heavy REE deposit, South China
  14. Paratobermorite, Ca4(Al0.5Si0.5)2Si4O16(OH)·2H2O·(Ca·3H2O), a new tobermorite-supergroup mineral with a novel topological type of the microporous crystal structure
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  17. Hydrogen solubility in FeSi alloy phases at high pressures and temperatures
  18. First evidence of dmisteinbergite (CaAl2Si2O8 polymorph) in high-grade metamorphic rocks
  19. New Mineral Names
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