Jewelry &amp; Gems The Buying Guide

Matlins, Antoinette Leonard; Bonanno, Antonio C.

doi:10.1007/978-94-011-7463-3

Cited by 4 publications

(5 citation statements)

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“…Descriptions are vague. Matlins & Bonanno (1995) ascribed the phenomenon to "a strong internal iridescence", and Foerster (1991) referred to the presence of "microcrystallites".…”

Section: Definitionsmentioning

confidence: 99%

Micro-Analytical Study of the Optical Properties of Rainbow and Sheen Obsidians

Ma¹,

Gresh²,

Rossman³

et al. 2001

The Canadian Mineralogist

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Samples of Mexican obsidian that exhibit either "sheen" or "rainbow" optical properties were examined with a combination of EMP, SEM, TEM, as well as visible and IR spectroscopy. Electron-microprobe analyses of the sheen matrix give (in wt.%): 76.2 SiO 2 , 0.2 TiO 2 , 11.6 Al 2 O 3 , 2.2 FeO TOT , 0.07 MgO, 0.1 CaO, 4.8 Na 2 O and 4.4 K 2 O. The sheen is attributed to the presence of aligned flow-stretched hollow vesicles in the gemological literature. SEM images show that many of the flow-aligned lenticular areas are a second rhyolite glass with, on average, 74.6 SiO 2, 0.2 TiO 2 , 12.7 Al 2 O 3 , 2.1 FeO TOT , 0.1 MgO, 0.9 CaO, 5.6 Na 2 O and 4.6 K 2 O. These two compositions do not overlap at the 2 level. Their inferred indices of refraction differ by as much as 0.04, leading to optical interference along the elliptical interfaces of the two glasses. Thus we postulate that the sheen reflects differences in indices of refraction () between the matrix obsidian and the lower of either gas-filled or glass-filled vesicles. In our sample, the presence of the second glass probably correlates with incorporation (and remelting?) of fragments of an earlier rhyolitic ash or tuff. Two different types of Mexican rainbow obsidian were studied. The first has layers of numerous trachytically oriented rods (

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“…Descriptions are vague. Matlins & Bonanno (1995) ascribed the phenomenon to "a strong internal iridescence", and Foerster (1991) referred to the presence of "microcrystallites".…”

Section: Definitionsmentioning

confidence: 99%

Micro-Analytical Study of the Optical Properties of Rainbow and Sheen Obsidians

Ma¹,

Gresh²,

Rossman³

et al. 2001

The Canadian Mineralogist

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“…Light localization proximal to the Anderson regime can easily be observed in low-dimensional natural samples even with a weak refractive index contrast. , Transmission in a highly multilayered system is governed by the excitation of single resonance states and occasionally multiple resonances hybridized in space (also known as necklace states), ,− offering diverse bases for compressing sampling. Impressively, professional jewelers already knew this: “ When you see a fine pearl, the first thing you notice is its lustrous glow. Luster is not a superficial shine such as you see in imitation pearls, but an intense brightness that results from rays of light traveling through the numerous layers of nacre and being reflected back from within pearls.…”

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confidence: 99%

A Pearl Spectrometer

Kwak

Park

et al. 2020

Nano Lett.

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Information recovery from incomplete measurements, typically performed by a numerical means, is beneficial in a variety of classical and quantum signal processing. Random and sparse sampling with nanophotonic and light scattering approaches has received attention to overcome the hardware limitations of conventional spectrometers and hyperspectral imagers but requires high-precision nanofabrications and bulky media. We report a simple spectral information processing scheme in which light transport through an Anderson-localized medium serves as an entropy source for compressive sampling directly in the frequency domain. As implied by the “lustrous” reflection originating from the exquisite multilayered nanostructures, a pearl (or mother-of-pearl) allows us to exploit the spatial and spectral intensity fluctuations originating from strong light localization for extracting salient spectral information with a compact and thin form factor. Pearl-inspired light localization in low-dimensional structures can offer an alternative of spectral information processing by hybridizing digital and physical properties at a material level.

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“…4 GIA -Gemological Institute of America. 5 Dokładne omówienie barw dla diamentów w kolorach fantazyjnych można odnaleźć w pracach (Hofer 1998;Matlins, Bonanno 1989). …”

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Diamenty w kolorach fantazyjnych – charakterystyka walorów inwestycyjnych

Potrykus¹

2017

Granice Finansów XXI Wieku. Finanse Publiczne, Rynek Finansowy, Finanse Przedsiębiorstw

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Jewelry & Gems The Buying Guide

Cited by 4 publications

References 0 publications

Micro-Analytical Study of the Optical Properties of Rainbow and Sheen Obsidians

Micro-Analytical Study of the Optical Properties of Rainbow and Sheen Obsidians

A Pearl Spectrometer

Diamenty w kolorach fantazyjnych – charakterystyka walorów inwestycyjnych

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