The power of spectroscopy at your fingertips Gemology spectra · The power of spectroscopy at your...
Transcript of The power of spectroscopy at your fingertips Gemology spectra · The power of spectroscopy at your...
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GoSpectroThe power of spectroscopy at your fingertips
Gemology spectraToward the creation of a gemology spectral database
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Spectrum in the literature
Red Garnet (Fe2)
5 dark lines with variable width and strengths at 510, 525, 580, 625 and 680 nm.
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Red glass (Se)
Spectrum in the literature
Only one band in the red region.No transmission observed in the blue region.
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Synthetic Ruby (Cr3)
Spectrum in the literature
One broad dark line around 550 nm.One sharp dark line around 680 nm.One sharp photoluminescence line around 690 nm.
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Natural Ruby (Cr3)
Spectrum in the literature
Same as synthetic Ruby except that the absorption band at 550 nm is not as strong.The photoluminescence line seems a bit more intense.
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Red Spinel (Cr) natural
Broad absorption band below 550 nm.No specific feature observed.No reference spectrum available.
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Zircon (Cr2)
Spectrum in the literature
Characteristic spectrum with multiple sharp absorption lines of varying intensities (490, 515, 540, 560, 590, 655, 690 nm)
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Peridot (Fe)
Spectrum in the literature
3 sharp dark lines, hardly visible in the blue part of the spectrum.
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Emerald (Cr)
Spectrum in the literature
One main transmission band centered at 515 nmSeries of peaks above background around 660 nm.No fluorescence observed under laserexcitation.
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Hydrothermal Emerald synthetic (Cr)
Spectrum in the literature
One main transmission band centered at 515 nm (slightly blue-shifted compared to natural emerald).Series of sharp lines around 660 nm.Fluorescence observed under laser excitation.
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Blue Sapphire natural (Fe3)
Spectrum in the literature
One absorption line at 450 nm.
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Cobalt blue glass
One very broad absorption band centered around 600 nm.Only two fairly broad transmission bands in the blue and red ends of the visible spectrum.
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Blue synthetic Spinel
Spectrum in the literature
Three sharp dark lines around 550 nm, 585 nm and 630 nm.
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Apatite
Three sharp dark lines around 530 nm and 588 nm.
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Phosphate glass colored by Nd
Neodymium exhibits many absorption lines throughout the visible spectrum.