Intriguing minerals: quartz and its polymorphic modifications

Jovanovski, Gligor; Makreski, Petre

doi:10.1007/s40828-022-00165-2

Cited by 6 publications

(2 citation statements)

References 101 publications

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“…[ 45 ]. The set of varieties has recently been reviewed by Jovanovski et al [ 46 ]. As to the most valuable quartz gemstones, that is the macro-crystalline varieties, the main mechanism generating colour is that of colour centres associated with ions external to the structure of quartz, mostly Fe 3+ and Al 3+ [ 47 ].…”

Section: Resultsmentioning

confidence: 99%

The Use of UV-Visible Diffuse Reflectance Spectrophotometry for a Fast, Preliminary Authentication of Gemstones

et al. 2022

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The identification of gemstones is an important topic in the field of cultural heritage, given their enormous value. Particularly, the most important precious stones, namely diamond, emerald, ruby and sapphire, are frequently subjected to counterfeit by substitution with objects of lesser value with similar appearance, colour or shape. While a gemmologist is able to recognise a counterfeit in most instances, more generally, it is not easy to do this without resorting to instrumental methods. In this work, the use of UV-visible diffuse reflectance spectrophotometry with optic fibres (FORS) is proposed as a fast and easy method for the preliminary identification of gemstones, alternative to the classical methods used by gemmologists or to Raman spectroscopy, which is by far the instrumental method with the best diagnostic potential, but it cannot be used in situations of problematic geometric hindrance. The possibilities and the limitations given by the FORS technique are critically discussed together with the spectral features of the most important gemstones. Finally, the application of chemometric pattern recognition methods is described for the treatment of large sets of spectral data deriving from gemstones identification.

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Section: Resultsmentioning

confidence: 99%

The Use of UV-Visible Diffuse Reflectance Spectrophotometry for a Fast, Preliminary Authentication of Gemstones

et al. 2022

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“…Citrine is a variety of quartz [16]. It is transparent yellow to orange-brown, and the name comes from the old French word "citrin", which means yellow [17]. Natural citrine can be found in the same environment as smoked quartz, however the it could be synthetically-grown from seeds of natural rock crystal [18].…”

Section: Introductionmentioning

confidence: 99%

Influence of citrine on the self-adhesive properties of silicone pressure-sensitive adhesives

Antosik,

Mozelewska,

Wilpiszewska

2024

Preprint

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The presented article provides a detailed comparison of two silicone adhesives named 288 and 922. Various contents of dichlorobenzoyl peroxide, the cross-linking agent (0-3% by weight), were examined. A series of tests, including adhesion, tack, cohesion at room temperature and elevated temperature, SAFT test, and shrinkage, were conducted. Silicone-based self-adhesive adhesives are known for their excellent self-adhesive properties and find applications in various industrial sectors. However, their thermal resistance is relatively low. Therefore, the best composition was selected and modified with different filler concentrations, namely citrine, ranging from 0.1 to 3.0% by weight. During the conducted research, an increase in the thermal resistance of the adhesive up to a temperature of 225°C was observed, which constitutes a positive phenomenon in the field of self-adhesive adhesive technology. The purpose of these studies was to significantly improve the properties of silicone adhesives, and the modification using citron proved to be an effective means of achieving this goal. The obtained results indicate potential opportunities for refining and customizing silicone-based pressure-sensitive adhesives, which can significantly enhance their performance and flexibility in industrial applications.

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Variability of chemical, mineralogical, and morphological attributes of five soils of the Guabirotuba formation

Muñoz,

Villota-Mora,

Pudell

et al. 2023

Arab J Geosci

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Intriguing minerals: quartz and its polymorphic modifications

Cited by 6 publications

References 101 publications

The Use of UV-Visible Diffuse Reflectance Spectrophotometry for a Fast, Preliminary Authentication of Gemstones

The Use of UV-Visible Diffuse Reflectance Spectrophotometry for a Fast, Preliminary Authentication of Gemstones

Influence of citrine on the self-adhesive properties of silicone pressure-sensitive adhesives

Variability of chemical, mineralogical, and morphological attributes of five soils of the Guabirotuba formation

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