Recently the author examined an interesting new variety of chalcedony from Indonesia (figure 1). Samples were sourced from Greek dealer Yianni Melas in order to document the new material. Gemologically, the properties are consistent with chalcedony, including a refractive index of 1.54 and a specific gravity of 2.56. However, this material is particularly notable for its mineral inclusions. Much like confetti thrown in the air as a celebration, a multitude of blue, green, and metallic inclusions (figure 2) were scattered throughout the chalcedony matrix. Advanced testing, including Raman spectroscopy and energy-dispersive X-ray fluorescence analysis combined with microscopic observation, confirmed the presence of chrysocolla, malachite, native copper, and cuprite.
Melas plans to market this new material under the trade name “Aquadite.” This fascinating chalcedony from Indonesia should be a popular gem for any collector who enjoys unique examples of vibrantly colored chalcedony.
Recently the author examined an interesting new variety of chalcedony from Indonesia (figure 1). Samples were sourced from Greek dealer Yianni Melas in order to document the new material. Gemologically, the properties are consistent with chalcedony, including a refractive index of 1.54 and a specific gravity of 2.56. However, this material is particularly notable for its mineral inclusions. Much like confetti thrown in the air as a celebration, a multitude of blue, green, and metallic inclusions (figure 2) were scattered throughout the chalcedony matrix. Advanced testing, including Raman spectroscopy and energy-dispersive X-ray fluorescence analysis combined with microscopic observation, confirmed the presence of chrysocolla, malachite, native copper, and cuprite.
Melas plans to market this new material under the trade name “Aquadite.” This fascinating chalcedony from Indonesia should be a popular gem for any collector who enjoys unique examples of vibrantly colored chalcedony.
