jade, fei cui jade, jadeite, nephrite, kosmochlor, omphacite
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The Hardness of Fei Cui Jade | A Gemological Perspective
Jade has a long and varied nomenclatural history, with its definition altered in the current age for practical and cultural reasons. This paper examines the hardness of "fei cui" (pyroxene jade) and presents the findings in a simplified format based on empirical evidence and theoretical principles, while also considering the jade hardness data available in literature.