Similarities and differences among selected gemmological varieties of chalcedony: chemistry, mineralogy and microstructure
Sara Monico,
Marco Cantaluppi,
Valeria Diella
et al.
Abstract:This study describes a new variety of chalcedony with a unique inhomogeneous bluish green hue, named aquaprase. It was discovered in Africa and is considered to be a valuable addition to the gem trade. A multi-methodological approach was used to examine its chemistry, mineralogy and microstructure, which were then compared to those of chrysoprase and agate, two of the most popular varieties of chalcedony. Optical microscopy revealed a complex microstructural heterogeneity in the different colour intensity area… Show more
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