Substances the Calm the Spirit

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Which of the following substances is salty in flavor, meaning it can soften hardness and dissipate nodules? Especially for lumps on the neck such as goiter and scrofula.

Zi Shi Ying (flouritum)
Long Gu (fossilia ossis mastodi)
Mu Li (ostrea concha)
Hu Po (succinum)

Long Gu and Mu Li are very similar, but Mu Li is the one that is salty and can soften hardness.

Source: Bensky, D. (2004). Chinese Herbal Medicine: Materia Medica. Seattle, WA: Eastland Press. pp. 914 [Q1171]