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Keywords = blue iolite

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12 pages, 7271 KiB  
Article
Feasibility Study on Color Grading of Blue Iolite Based on GemDialogue Color Comparison Charts
by Xin Liu and Ying Guo
Appl. Sci. 2023, 13(11), 6475; https://doi.org/10.3390/app13116475 - 25 May 2023
Cited by 2 | Viewed by 1434
Abstract
To explore the feasibility of applying the GemDialogue color comparison charts to the color grading of blue iolite, the color of the charts was quantified by the integrating sphere handheld spectroscopy in this paper, and the screened data were classified into a total [...] Read more.
To explore the feasibility of applying the GemDialogue color comparison charts to the color grading of blue iolite, the color of the charts was quantified by the integrating sphere handheld spectroscopy in this paper, and the screened data were classified into a total of 9 categories using the elbow rule and K-Means clustering analysis. Using Fisher’s discriminant to perform discriminant analysis on the 9 categories that have been classified, the discriminant function equation was established separately to verify the accuracy of this classification. Finally, the color parameters of iolite samples were substituted into the discriminant formula to obtain the color grade. By combining the classification results and visual observation, it is clear that applying the GemDialogue color charts to blue iolite color grading is feasible. Full article
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10 pages, 3702 KiB  
Article
Study on the Color-Influencing Factors of Blue Iolite
by Xin Liu and Ying Guo
Minerals 2022, 12(11), 1356; https://doi.org/10.3390/min12111356 - 26 Oct 2022
Cited by 9 | Viewed by 2285
Abstract
This article explores the factors that influence the color of blue iolite, which is the gem-quality variety of the cordierite mineral. The X-Rite SP62 portable spectrophotometer was used to measure color in the CIELAB color space. ED-XRF and UV–vis were used for analysis. [...] Read more.
This article explores the factors that influence the color of blue iolite, which is the gem-quality variety of the cordierite mineral. The X-Rite SP62 portable spectrophotometer was used to measure color in the CIELAB color space. ED-XRF and UV–vis were used for analysis. The results show that blue iolite contains the chromophore elements Fe and Mn, but the effect on the color of iolite is not significant due to the low Mn content. The lightness L* and the hue angle h° are mostly determined by its Fe content. UV–vis spectra show that iolite has a broad absorption band near 570 nm caused by the charge transfer between Fe2+ on the octahedron and Fe3+ on the T11 tetrahedron and results in the color of blue iolite. Each different standard light source has different degrees of influence on the color parameters of iolite, and the hue angle h° is the most influenced. Full article
(This article belongs to the Special Issue Colours in Minerals and Rocks, Volume II)
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