金石簿五九數訣
磁石

磁石

磁石

出磁州，但引得六七鍼者，皆名上好，即堪用。

End of chapter
石鍾乳石腦

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

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