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

5th International Conference on Theoretical and Applied Physics 2015

Suastika, Komang Gde^1 ; Yuwana, Lila^2 ; Hakim, Luqman^1 ; Darmaji^3 ; Khusnul, Didik^3

Program Studi Pendidikan Fisika, Universitas Palangka Raya, 73112, Indonesia^1

Jurusan Fisika FMIPA, ITS Surabaya, Indonesia^2

Pusat Studi Sains Institut Teknologi Sepuluh November (ITS) Surabaya, Indonesia^3

关键词: Cell parameter;    Cell volume;    Crystal system;    Degree of crystallinity;    Energy source;    Kalimantan;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/846/1/012024/pdf
DOI  :  10.1088/1742-6596/846/1/012024

来源: IOP

【 摘 要 】

X-Ray Diffraction (XRD) is one of spectroscopy method that utilize X-Ray as an energy source in the phases identification. This method is used to characterize the type of amethyst of Sukamara, Central Kalimantan. In this paper, the crystallography of three types of Sukamara amethyst is reported. Samples was collected directly from the amethyst mine in the Ajang village in the District of Permata Kecubung. The samples consists of three types i.e. purple amethyst, black amethyst, and violet amethyst. The results show that quartz or silica (SiO2) is the main phase of the gemstone amethyst. Amethyst cell parameters are a = b ≠ c and α = β ≠ γ, the crystal system is hexagonal. Amethyst average density is 2.65 g / cm3and 112.84 pm3cell volume. Peak FWHM value indicates that the degree of crystallinity of the black one is greater than that of the gasoline, while the degree of crystallinity of violet amethyst higher than purple amethyst.