金石簿五九數訣
玉

玉

玉

出藍田，形質不同，有五色，其中白者爲上。但取明淨潤澤無瑕，扣之作清聲者，爲上。

End of chapter
雄黄石硫黄

Text and scans: Shidian Guji (Peking University – ByteDance open ancient texts). Edition details are given per book. Shidian Guji

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