btsag

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བཙག
born, red ocher, strain, SA 'tshag pa [JV]

1) red ocher; 2) [f 'tshag],, will [split, collect, gather, strain, press, infuse, be radiantly healthy, assemble] [IW]

red ochre [RY]

(med) Laterite, Red ochre (Drungtso 1999, Yeshi 2018)
Synonyms : gai ri ka, tum ya (Shel gong) le rgan me tog (Yeshi 2018).
Sanskrit : gairika (Dash 1989)

lig bu mig dang de bzhin btsag yugs rnams / mig nad rus tshad sel zhing chu ser skem /... / btsag ni / rdo btsag dmar po ste / ming ni / gai ri ka dang / tum ya zer / 'dis 'og nas don pa'i rdo btsag dmar po shing tshon nyen pa de'o / yugs ni /... (Shel gong shel phreng, pdf p 132.1)

Illustrations : 'Phrin Las (25_122) btsag

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, btsag, yug and rdo mkhris 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.
Laterite (Iron oxide Fe₂O₃) is a highly weathered, red subsoil rich in hydrous iron oxides, developed in humid, tropical, and subtropical regions of good drainage. 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 (mindat.org).
Ochre is a name given to a great variety of earthy minerals, usually mixtures of fine-grained oxides/hydroxides. Mostly Iron ochre, but also Antimony ochre, Bismuth ochre, Lead ochre and Molybdic ochre. Iron ochre is a very fine grained mixture of iron oxides (mostly goethite or limonite, sometimes with hematite, often admixed with clays and other minerals (mindat.org)
The indian name gairika denotes red ochre (wisdomlib.org)
Johannes Schmidt (talk) 09:52, 27 February 2024 (EST)