Characterization of Central Kalimantan’s Amethysts by Using X-Ray Diffraction

Suastika, Komang Gde; Yuwana, Lila; Hakim, Luqman; Darmaji,; Khusnul, Didik

doi:10.1088/1742-6596/846/1/012024

Cited by 5 publications

(2 citation statements)

References 6 publications

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“…For example, the crystallite size of opal gemstone from California USA was found to be 15 nm (150 Å) (Sanders, 1975). The crystallite size of amethyst gemstone from Central Kalimantan was 14 nm (Suastika et al, 2017). A recent study found that the crystallite size of gold nanoparticles was 18 -24 nm (Ogundare et al, 2019).…”

Section: Discussionmentioning

confidence: 98%

Analysis of Crystallinity and Physical Properties of the Bio-solar Gemstone

Ismail

Nizar²,

Murzal³

et al. 2020

Aceh Int. J. Sci. Technol

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– Bio-solar is one of the natural gemstones found in the province of Aceh in Indonesia. A recent study suggested that this gemstone could be considered as a vesuvianite type of gemstone. Nevertheless, detail information of this bio-solar gemstone is still unknown. We do not know whether the bio-solar gemstone is crystalline or amorphous. The specific gravity and the hardness of this gemstone are also still unknown. This information is essential to determine the quality of a gem. To answer those questions, we have used x-ray diffraction to study the bio-solar gemstone from the province of Aceh in Indonesia. The physical properties (specific gravity and hardness) of this gemstone have also been measured. We found that the bio-solar gemstone is composed by CaO, SiO2, MgO, Al2O3, Fe2O3, and TiO2 phases. Our results revealed that the bio-solar gem is a crystalline material, not amorphous. The average crystallite size of this gemstone is found to be 353 Å (35 nm). Moreover, the specific gravity of bio-solar gemstone is found to be 3.09 – 3.34. Its hardness is 3 to 4 mohs. Thus, the bio-solar is a good quality gemstone. Our finding confirmed that the bio-solar could be classified as a vesuvianite gemstone.

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Section: Discussionmentioning

confidence: 98%

Analysis of Crystallinity and Physical Properties of the Bio-solar Gemstone

Ismail

Nizar²,

Murzal³

et al. 2020

Aceh Int. J. Sci. Technol

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“…In normal XRD experiments, 0.02° (2θ) is commonly selected as the step angle [41,[64][65][66]. For the identification of unknown gems by XRD, it is certainly favoured if samples can be measured as careful as possible so that the unconspicuous information like impurity and locality may be found or deduced.…”

Section: Determination Of the Optimal Experimental Parametersmentioning

confidence: 99%

Nondestructive identification of gemstones by using a portable XRF–XRD system: an illuminating study for expanding its application in museums

Shen

2020

SN Appl. Sci.

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Nine gemstone samples were analysed by using a portable X-ray fluorescence-X-ray diffraction (XRF-XRD) system without any destructive preparation processes. The samples were measured by groups based on the transparency and the complexity of molecular structure. The XRF and the XRD measurements for each sample were performed simultaneously.The key experimental parameters were optimized in order to obtain XRD patterns acceptable for phase identification in a limited time. The XRF spectrum of each sample was analysed first to acquire the elemental composition qualitatively, and the information was then applied to refining possible phases. The phase analysis process of each sample was described in detail and the most likely phases were determined. Normal XRD experiments were conducted in order to verify the results. Advantages, disadvantages and applicable range of the system were analysed. The results indicate that the portable XRF-XRD system can be applied to identifying particular gemstones effectively, while single-crystal gems may not be identified very well. Wider recognition and application of the portable XRF-XRD system in cultural heritage and gemological fields call for hardware development, software updating and more real application cases.

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XRD and XRF characterization of white sand from Sambera Village, East Kalimantan, Indonesia

Muliawan¹,

Sali

Mustakyudin

et al. 2019

J. Phys.: Conf. Ser.

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Characteristic of sand at Sambera village based on crystallography using X-ray diffraction and X-ray fluorescence methods was discussed in this article. This research aims to determine the concentration of quartz based on two specimens obtained from two different places at Sambera village. The metal test on quartz sand with XRD method (X-Ray 0.15406 nm) revealed that the scatter angle at 2θ are 26.73210 and 26.73130 with crystal width of each location are 1.81085 nm and 1.03421 nm. While the XRF test revealed that the concentration of quartz are 79.1 % and 79.5 %. The Aluminium concentration are 14.9 % and 15.2 % respectively. The result revealed that the sand of Sambera village has potential to be used as quartz material and aluminum.

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Characterization of Central Kalimantan’s Amethysts by Using X-Ray Diffraction

Cited by 5 publications

References 6 publications

Analysis of Crystallinity and Physical Properties of the Bio-solar Gemstone

Analysis of Crystallinity and Physical Properties of the Bio-solar Gemstone

Nondestructive identification of gemstones by using a portable XRF–XRD system: an illuminating study for expanding its application in museums

XRD and XRF characterization of white sand from Sambera Village, East Kalimantan, Indonesia

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