nag mtshur

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ནག་མཚུར
mineral used for cleaning gold [JV]

black color producing mtshur zhig [IW]

(med) Fibroferrite, Ferric sulfate Fe³⁺ (SO₄) (OH)·5H₂O (Drungtso 1999, Phrin Las 1987, Yeshi 2018). Synonyms : nag tshur, ser tshur, tshur nag, tshur ser, sho 'na ka (Drungtso 1999, Yeshi 2018). Of yellow, yellowish-green to green-grey color. Fibroferrite is a fibrous aggregation containing iron (mindat.org). Johannes Schmidt (talk) 11:30, 25 November 2021 (UTC)