lcags rdo

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ལྕགས་རྡོ

shotput, flint stones, iron stone, iron ore [JV]

iron ore [RY]

(med) Iron ore (Drungtso 1999), Limonite (Yeshi 2018)
Synonyms : gru bzhi, brgya rdo, zhang blon bla rdo, sin dhu ra, rgya mtsho'i breg pa, mkha 'gro'i mnyal khrag (Yeshi 2018).

lcags kyi rdo bas tshe 'phel bcud len byed / ces par ka dog nag po dang ser po gnyis / gang yang lci la bzhus na lcags 'byungs ba de yin / rgyu ngar mnyen gnyis pho mo rgod g.yung rim pa'o // (Shel gong shel phreng, pdf p 115.1)

Several names and notices in the Shel phreng deal with iron oxides, commonly identified as Limonite : lcags rdo in the meltable medicinal stone section, gru bzhi and btsag as well as smug po sbal rgyab and smug po chig thub within the non-meltable medicinal stones, and sin dhu ra in the medicinal earth section.
The chief ores of iron consist mainly of the oxides, like Hematite, Goethite or Limonite ; as well as the carbonate Siderite. Siderite (FeCO₃) can be yellowish- to greyish-brown, green, red and black. Fungi like Lichenothelia may oxidize iron to produce Siderite, which is then considered a biomineral. Often found in bedded sedimentary deposits with a biological component, suggesting a biogenical origin. Numerous sites in Tibet. (mindat. org)
Johannes Schmidt (talk) 06:35, 25 February 2024 (EST)