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)
Illustrations : 'Phrin Las (31_003) lcags rdo
Several names and notices in the Shel phreng deal with iron oxides, often identified with Limonite : lcags rdo in the meltable medicinal stone section, gru bzhi and btsag within the non-meltable medicinal stones, and sin dhu ra in the medicinal earth section. The important iron ore Hematite (smug po sbal rgyab) is found with the non-meltable medicinal stones.
lcags rdo or Iron ores are ferruginous rocks containing one or more minerals from which metallic iron may be profitably extracted. The chief ores of iron consist mainly of the oxides, like Hematite, Goethite or Limonite ; as well as the carbonate Siderite. Limonite is used as a field-term of unidentified massive hydroxides and oxides of iron, with no visible crystals, and a yellow-brown streak. Limonite is most commonly the mineral species Goethite, along with impurities of other minerals such as quartz and clays. A very common material in the oxidized zones of iron-bearing deposits. 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). The latter is not mentioned in the identifications.
Johannes Schmidt (talk) 06:35, 25 February 2024 (EST)