2020
DOI: 10.15506/jog.2020.37.1.10
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Yellow Opal from Tanzania

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Cited by 2 publications
(2 citation statements)
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“…The refractive index for the samples is in the range of 1.44-1.45 and the values of specic gravity are ranging from 2.06 to 2.08, and these values are comparable with other opals in literatures. [22][23][24][25][26][27][28][29] The purple sample shows green uorescence under UV lamp. The specic gravity of pink sample is related to the inclusion of palygorskite.…”
Section: Gemological Propertiesmentioning
confidence: 99%
“…The refractive index for the samples is in the range of 1.44-1.45 and the values of specic gravity are ranging from 2.06 to 2.08, and these values are comparable with other opals in literatures. [22][23][24][25][26][27][28][29] The purple sample shows green uorescence under UV lamp. The specic gravity of pink sample is related to the inclusion of palygorskite.…”
Section: Gemological Propertiesmentioning
confidence: 99%
“…Opal is found globally, with Australia now being the top producer of black opal. Other places where opal is found include America, Tanzania, Brazil, Mexico, East Africa, Indonesia and Tanzania (Federman 1990;Banerjee and wenzel 1999;lynne et al 2005;Costanzo 2019;Štubňa and Hanus 2020). Opal is a gem included in the precious gems category (Boboň et al 2011).…”
Section: Introductionmentioning
confidence: 99%