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Answer first: green aventurine is generally a quartz-based gem material whose color and shimmering appearance are associated with tiny inclusions. The sparkling optical effect is called aventurescenc..

Answer first: “Alashan agate” is a jewelry-market name generally used for colorful chalcedony associated with Alxa (Alashan), Inner Mongolia. Agate is a fine-grained variety of quartz, but the commer..