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How Thin-Film Coatings Change the Face of Aquam...
Why a coating on aquamarine can change its visible color through thin-film interference without altering the bulk crystal, and how microscopy, spectroscopy, and elemental analysis help distinguish surface layers from...
How Thin-Film Coatings Change the Face of Aquam...
Why a coating on aquamarine can change its visible color through thin-film interference without altering the bulk crystal, and how microscopy, spectroscopy, and elemental analysis help distinguish surface layers from...
What Heating Can and Cannot Prove in Black Opal...
A mineralogical and analytical assessment of heat treatment in black opal, explaining why no single test can prove artificial heating and why water content, structure, and optical data must be...
What Heating Can and Cannot Prove in Black Opal...
A mineralogical and analytical assessment of heat treatment in black opal, explaining why no single test can prove artificial heating and why water content, structure, and optical data must be...
Reading Hematite's Color Through Instrumental S...
How crystal defects, valence states, and trace substitutions influence hematite's visible absorption, and why different analytical instruments support different color attributions in Fe2O3.
Reading Hematite's Color Through Instrumental S...
How crystal defects, valence states, and trace substitutions influence hematite's visible absorption, and why different analytical instruments support different color attributions in Fe2O3.
Why Kunzite's Color Depends on Direction: Pleoc...
Kunzite appears different colors from different directions because Mn3+ absorption in the anisotropic spodumene lattice is polarization-dependent. Learn the mechanism, evidence, and measurement limits.
Why Kunzite's Color Depends on Direction: Pleoc...
Kunzite appears different colors from different directions because Mn3+ absorption in the anisotropic spodumene lattice is polarization-dependent. Learn the mechanism, evidence, and measurement limits.
Sodalite, Hackmanite, and Reversible Tenebresce...
Why some sodalite specimens change color under ultraviolet light and fade in darkness, how tenebrescence differs from fluorescence, and what laboratory measurement can and cannot resolve.
Sodalite, Hackmanite, and Reversible Tenebresce...
Why some sodalite specimens change color under ultraviolet light and fade in darkness, how tenebrescence differs from fluorescence, and what laboratory measurement can and cannot resolve.
Detecting Synthetic Copal Resin: What Molecular...
How molecular structure controls solubility, thermal behavior, density, and spectroscopy in copal and synthetic resins, and why multiple lines of evidence are needed for identification.
Detecting Synthetic Copal Resin: What Molecular...
How molecular structure controls solubility, thermal behavior, density, and spectroscopy in copal and synthetic resins, and why multiple lines of evidence are needed for identification.