Characterization of Peridot from Sardinia, Italy

Gemological Characterization of Peridot from Pyaung-Gaung in Mogok, Myanmar

“…These bands were assigned to internal Si-O vibrations (Burns and Huggins, 1972). Although the IR patterns are quite similar to those of Sardinian peridot (reported in Adamo et al, 2009), the maxima positions of all IR bands can be shifted to either lower or higher frequency values depending on the content of iron (Fe 2+ ), as previously suggested by Duke and Stephens (1964), Burns and Huggins (1972), and Jovanovski et al (2006).…”

“…The absorption coefficient (α) was calculated from the true absorbance in an uncorrected ab- The absorption feature of this Burmese peridot is usually attributed to Fe 2+ , which is a main chromophore contributing to the green color. This spec-troscopic feature is also observed in peridot from other localities (e.g., Adamo et al, 2009;Thuyet et al, 2016;Sripoonjan et al, 2019).…”

“…The Yiqisong peridot possessed higher Na, Al, and Cr contents than the Pyaung-Gaung samples. Previous studies showed that the formation of Yiqisong peridot was related to serpentinization (Zhang et al, 2019) and/or spinel lherzolite that was quite similar to those of peridot from Sardinia and Vietnam (Adamo et al, 2009;Thuyet et al, 2016). In contrast, the study of Harlow and Thu (2014) indicated that samples from Pyaung-Gaung and Sapat shared a similar origin.…”

“…Several articles have presented geological and mineralogical data for gem peridot deposits worldwide, including Zabargad (Egypt), Arizona (United States), Mogok (Myanmar), Yiqisong (China), Kohistan (Pakistan), the Central Highlands of Vietnam, and localities in Ethiopia and Tanzania (Gübelin, 1981;Jan and Khan, 1996;Fuhrbach, 1998;Thuyet et al, 2016). Other studies have focused on peridot's gemological, chemical, and spectroscopic characteristics (e.g., Stockton and Manson, 1983;Koivula and Fryer, 1986;Fritsch and Lulzac, 2004;Adamo et al, 2009;Bouihol et al, 2015;Surour, 2018;Sripoonjan et al, 2019;Zhang et al, 2019).…”

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

“…( Figure 9 ). The colour is due to Fe 2+ ion [ 36 ] (weak bands between ca. 450 and 490 nm); other features at 513 and 653 nm can possibly be due to another chromophore such as Cr 3+ .…”