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Gemstone Science
Reading Prehnite's Pleochroism: How Polarized-L...
How polarized-light microscopy and directional absorption changed prehnite identification, separating true pleochroism from color change, iridescence, and isotropic lookalikes.
Reading Prehnite's Pleochroism: How Polarized-L...
How polarized-light microscopy and directional absorption changed prehnite identification, separating true pleochroism from color change, iridescence, and isotropic lookalikes.
Chrome Tourmaline and the Limits of Color as Ev...
Chrome tourmaline identification requires more than color. Learn how spectroscopy, trace-element analysis, and mineral identification combine to determine which chromophore causes green in tourmaline.
Chrome Tourmaline and the Limits of Color as Ev...
Chrome tourmaline identification requires more than color. Learn how spectroscopy, trace-element analysis, and mineral identification combine to determine which chromophore causes green in tourmaline.
When Diamond Looks Cloudy: Scattering, Transluc...
Explore the optical mineralogy of hazy diamonds: how internal scattering centers, strain, and planar features reduce transparency, what microscopy and spectroscopy can and cannot establish, and why laboratories may interpret...
When Diamond Looks Cloudy: Scattering, Transluc...
Explore the optical mineralogy of hazy diamonds: how internal scattering centers, strain, and planar features reduce transparency, what microscopy and spectroscopy can and cannot establish, and why laboratories may interpret...
Moldavite Provenance: What Internal Growth Feat...
How moldavite's internal growth and cooling features relate to provenance, why single inclusions cannot prove geographic origin, and how evidence chains support defensible conclusions.
Moldavite Provenance: What Internal Growth Feat...
How moldavite's internal growth and cooling features relate to provenance, why single inclusions cannot prove geographic origin, and how evidence chains support defensible conclusions.
Why Interference Colors Are Not a Reliable Fing...
Interference colors in synthetic emerald come from internal microstructure, not a unique synthesis signature. Learn why classification needs combined evidence, not one optical effect.
Why Interference Colors Are Not a Reliable Fing...
Interference colors in synthetic emerald come from internal microstructure, not a unique synthesis signature. Learn why classification needs combined evidence, not one optical effect.
Trace Elements and the Variable Behavior of And...
Why andalusite specimens look different: iron and manganese substitution, oxidation state, growth zoning, and pleochroism, plus what elemental analysis can and cannot establish.
Trace Elements and the Variable Behavior of And...
Why andalusite specimens look different: iron and manganese substitution, oxidation state, growth zoning, and pleochroism, plus what elemental analysis can and cannot establish.