mchong

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མཆོང
(p mtshongs -]]-jump, leap, gem [said to cure paralysis = chong dkar la sngo mdangs chags pa phyi nang mi sgrib pa zhig ste, nus pas gza' nad dang, gdon gzer sogs la phan [IW]

(p mtshongs -]]-jump, leap, gem [said to cure paralysis = chong dkar la sngo mdangs chags pa phyi nang mi sgrib pa zhig ste, nus pas gza' nad dang, gdon gzer sogs la phan'dzin] [IW]

(p mtshongs,, jump, leap, gem [IW]

agate, SA chong, a gem which cures paralysis, quartz [JV]

agate; p. mchongs, to jump [RY]

(sman) Agate (dGa' ba'i rDo rje 1998)

mchong dang ma rgad dag kyang de dang 'dra / 'di la rigs bzhi 'byung ba'i mchog ni / dkar la sngo mdangs can dangs pas phyi nang mi bsribs pa zhig 'byung ba dkar mo lag g.yas zhes pas sde brgyad srung nus pa'i nor bu yin pa dang / de 'dra ba las de tsam mi dangs pa dmar mdangs chags pa ma na huM zhes pa'ang snga ma dang phyogs mtshungs tsam mo / 'di gnyis ma h+'a ts+'i na nas 'byung / kha che'i yul nas 'byung ba'i [093] dmar po dang / sna rabs kyi dkar khra zhig 'byung ba dman par bshad / nus pa gzi dang 'dra zhes pa'o // (Shel gong shel phreng, pdf p 092.5)

Illustrations : dGa' ba'i rDo rje 2018 (n°041) mchong, Achates (n°042) ma na ho dmar po, Red agate sardonyx

The Shel gong mentiones 4 types. The 2 from China, the white dkar mo lag g.yas and the red ma na hung, are superior. 2 come from Kashmir, one red coloured, another white-banded. They are inferior. ma rgad refers to Emerald or gemstones of the Beryl groupe.
dGa' ba'i rDo rje (2018) shows the superiour types according to the Shel gong.
dGa' ba'i rDo rje (1998) does not present mchong as a general name, yet he mentions a number of minerals, indicating that they are of the mchong type (mchong gi rigs) or identifies it as Agate : khra man, rdo'i snying po, chu snying, bel snabs, chu yi nor bu. Or he alludes to their similarity with mchong (khyung skyugs, gzi). Others are ambiguous with respect to their identification (chu chung ni la, lig bu mig).
Agates are part of the group of microcrystalline quartz or chalcedony. They are mostly found as nodules in cavities, the latter were formed when gas bubbles were trapped in cooling lava. These were filled with hot, silica-rich water which crystallised in a complex process into agates. When silica concentration in the silica gel is low, quartz crystals ( colourless or amethyst type) form around the center which remains hollow.
Higher silica concentrations form agates which are composed of bands of chalcedony fibres, and because the colors and patterns found in agates are so varied and so characteristic for the respective localities, that there is a confusingly large number of ever-changing varietal and trade names (mindat.org).
Johannes Schmidt (talk) 12:52, 29 February 2024 (EST)