gru bzhi

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གྲུ་བཞི
square [RY]

khru bzhi - out cubit [RY]

1) ngos bzhi great and small snyom pa'i thing; 2) med. mineral (/ [astringent, heating, by its power klad skyon gso, chu ser skem] [IW]

square, earth, seat, a stone, 1 of dbyibs gzugs brgyad, square [JV]

(med) Limonite (Yeshi 2018)
Synonyms : brgya rdo, zhang blon bla rdo (Yeshi 2018)

gru bzhis klad pa gso zhing chu ser 'dren / zhes dang / rang byung pas / nag po gru bzhis mchin sman phan / gsungs pa / rdo smug nag ser kha cung zad yod pa / dbyibs gru bzhi kho na las mi yong ba bcag na phyi nang thams [128] cad rgyu cig pa 'di nyid ('di li thang rlung 'chub snang na mang du yod) yin / pha bang skabs bshad ltar 'di dang rgyu dbyibs nus pa pha bang dang mi 'dra ba gsal ba'o // (Shel gong shel phreng, pdf p 127.6)

Illustrations : 'Phrin Las (25_096) gru bzhi ser po'am dkar po (25_097) nag po'i smug po

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.
Limonite (Iron(III) oxide-hydroxide) 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)
Johannes Schmidt (talk) 10:04, 27 February 2024 (EST)