Search Results - "Palke, Aaron C."

THE PRIMARY SAPPHIRE OCCURRENCE AT FRENCH BAR SILL ALONG THE MISSOURI RIVER, NEAR HELENA, MONTANA.

Authors: Kane, Robert E. Pettman, Kory L. Palke, Aaron C. et al.

Source: Gems & Gemology; Winter2025, Vol. 61 Issue 4, p332-353, 22p

DIAMONDS.

Authors: Pignatelli, Isabella Ferraris, Cristiano Schaniel, Dominik et al.

Source: Gems & Gemology; Fall2025, Vol. 61 Issue 3, p326-330, 5p

CLASSIFICATION OF GEM MATERIALS USING MACHINE LEARNING.

Authors: Hardman, Matthew F. Homkrajae, Artitaya Eaton-Magaña, Sally et al.

Source: Gems & Gemology; Fall2024, Vol. 60 Issue 3, p306-329, 24p

STRUCTURES BEHIND THE SPECTACLE: A REVIEW OF OPTICAL EFFECTS IN PHENOMENAL GEMSTONES AND THEIR UNDERLYING NANOTEXTURES.

Authors: Jin, Shiyun Renfro, Nathan D. Palke, Aaron C. et al.

Source: Gems & Gemology; Summer2025, Vol. 61 Issue 2, p110-170, 61p

THE 3309 CM–1 SERIES IN SAPPHIRE AND RUBY: A FOCUS ON FTIR PEAK POSITION VARIATION.

Authors: Soonthorntantikul, Wasura Palke, Aaron C.

Source: Gems & Gemology; Spring2025, Vol. 61 Issue 1, p2-15, 14p

THE 3309 CM^–1 SERIES IN SAPPHIRE AND RUBY: A FOCUS ON FTIR PEAK POSITION VARIATION.

Authors: Soonthorntantikul, Wasura Palke, Aaron C.

Source: Gems & Gemology. Spring2025, Vol. 61 Issue 1, p2-15. 14p.

APPLICATION OF UV-VIS-NIR SPECTROSCOPY TO GEMOLOGY.

Authors: Shiyun Jin Renfro, Nathan D. Palke, Aaron C. et al.

Source: Gems & Gemology; Winter2024, Vol. 60 Issue 4, p456-473, 18p

Petrogenesis of Montana, USA Sapphires Inferred from Oxygen Isotopes and Zircon Inclusions.

Authors: Turnier, Rachelle B Berg, Richard B Kitajima, Kouki et al.

Source: Journal of Petrology; Oct2024, Vol. 65 Issue 10, p1-19, 19p

Statistically Quantifying the Trace-Element Composition of Coloured Gemstones: How Does the Number of LA-ICP-MS Analytical Spots Affect Evaluation of Their Composition?

Authors: Hardman, Matthew F. Shigley, James E. Sun, Ziyin et al.

Source: Journal of Gemmology. 2026, Vol. 40 Issue 2, p157-169. 13p.

Gems Recovered from Sedimentary Rocks.

Authors: Shigley, James E. Bassoo, Roy Palke, Aaron C.

Source: Gems & Gemology; Winter2023, Vol. 59 Issue 4, p510-523, 14p

SPECIAL COLORS AND OPTICAL EFFECTS OF OREGON SUNSTONE: ABSORPTION, SCATTERING, PLEOCHROISM, AND COLOR ZONING.

Authors: Shiyun Jin Palke, Aaron C. Renfro, Nathan D. et al.

Source: Gems & Gemology; Fall2023, Vol. 59 Issue 3, p298-322, 25p

COLOR MODIFICATION OF SPINEL BY NICKEL DIFFUSION: A NEW TREATMENT.

Authors: Jollands, Michael Ludlam, Jollands Palke, Aaron C. et al.

Source: Gems & Gemology; Summer2023, Vol. 59 Issue 2, p164-181, 18p

High-pressure behavior and structural transition of beryl-type johnkoivulaite, Cs(Be2B)Mg2Si6O18.

Authors: Diego Gatta, G. Ende, Martin Miloš, Sofija et al.

Source: American Mineralogist; Jan2024, Vol. 109 Issue 1, p15-23, 9p

GEMOLOGICAL CHARACTERIZATION OF MONTANA SAPPHIRE FROM THE SECONDARY DEPOSITS AT ROCK CREEK, MISSOURI RIVER, AND DRY COTTONWOOD CREEK.

Authors: Palke, Aaron C. Renfro, Nathan D. Hapeman, Jeffrey R. et al.

Source: Gems & Gemology; Spring2023, Vol. 59 Issue 1, p2-45, 44p

G&G Gem News International.

Authors: Ziyin Sun Renfro, Nathan D. Palke, Aaron C. et al.

Source: Gems & Gemology; Fall2017, Vol. 53 Issue 3, p373-386, 14p, 22 Color Photographs, 1 Black and White Photograph, 4 Graphs, 2 Maps

TREATMENTS.

Authors: Wasura Soonthorntantikul Sudarat Saeseaw Palke, Aaron et al.

Source: Gems & Gemology; Fall2021, Vol. 57 Issue 3, p283-290, 8p

PURPLE GEM SPINEL FROM VIETNAM AND AFGHANISTAN: COMPARISON OF TRACE ELEMENT CHEMISTRY, CAUSE OF COLOR, AND INCLUSIONS.

Authors: Belley, Philippe M. Palke, Aaron C.

Source: Gems & Gemology; Fall2021, Vol. 57 Issue 3, p228-238, 11p

Synthetic color-change wakefieldite.

Authors: Ziyin Sun Shiyun Jin Gudino, Adriana et al.

Source: Gems & Gemology; Spring2023, Vol. 59 Issue 1, p156-158, 3p

Color effects of Cu nanoparticles in Cu-bearing plagioclase feldspars.

Authors: Jin, Shiyun Sun, Ziyin Palke, Aaron C.

Source: American Mineralogist; Dec2022, Vol. 107 Issue 12, p2188-2200, 13p

Unusual Composite Apatite-CO2 Inclusions in Sapphires from Ohn Bin Yee Htwet, Myanmar.

Authors: Palke, Aaron C. Skalwold, Elise A. Koivula, John I.

Source: Gems & Gemology; Winter2021, Vol. 57 Issue 4, p382-383, 2p