nya phyis

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ཉ་ཕྱིས
mother-of-pearl; mother of pearl/ oyster shell/ oyster [RY]

[mother-of-]pearl [IW]

mother of pearl, oyster shell [JV]

1) mother-of-pearl [rin po che'i sman gyi rigs shig ste, ro bska, zhu rjes bsil, nus pas klad skyon gso, rtsa dkar gyi nad sel, dug nad 'joms; 2) oyster, pearl engendering shellfish) [IW]

(med) Oyster shell, Black-lip Pearl Shell (Yeshi 2017).
nya phyis mu tig nus pa khyad par med / ces par ming / nya skogs / mu tig shun pa / nya phyis rnams zer / 'di la rigs gnyis / bzang ba dud ltar 'khril ba mdangs dkar la 'od dmar zhing mdangs lnga 'char ba dang / ngan pa leb mo gnyis thal mo sbyar ba lta bu phyi la chu dreg nag [096] po yod pa nang dkar la 'od lnga'i mdangs snga ma las dman tsam 'phro zhing nang du mu tig gi 'brum phran yod pa bzang / med pa ngan / phyi ma 'di nya'i sog pa yin smra ba ni ma mthong ba'i tshod gtam ste / gnyis ka 'bu skyogs kyi rigs yin / phyi ma 'di rgya nag gi yul / yan cu man dang / co ho shis zer ba rnams kyi chu nang du che ba khru re man dang / chung ba sen mo tsam gyi bar 'byung la nang du 'bu mcher pa 'dra ba yod pa / sgang nas kha 'byur ba'i 'dab nas phye la 'bu mngon pas rdo gseng du 'gro ba mthong / da lta rgyas phreng ba dang pad 'dab sogs 'chos nas 'tshong ba 'di yin no // (Shel gong shel phreng, pdf p 095.5)

Illustrations : 'Phrin Las (25_054) nya phyis

Mother of Pearl (nya phyis) and pearls (mu tig) are organic gemstones produced through biomineralization by some molluscs as a coating or defense reaction inside their shells. The Chinese Pharmacopoeia prescribes Pteria martensii (Dunker), Hyriopsis cumingii (Lea) and Cristaria plicata (Leach) for the drugs Margarita (pearl) and Margaritifera Concha (nacre). Yeshi (2018) identifies Black-lip Pearl Oyster, Pinctada margaritifera L. All are saltwater oysters, preferred to freshwater oysters. None of them are related to edible oysters. Nacre consists of platelets of aragonite (calcium carbonate), the iridescent effect is caused by the size of these platelets being close to the wavelength of visible light, resulting in diffraction in different directions for different wavelengths (colours) of light (mindat.org).
The indian name śukti indicates an oyster shell or pearl-oyster, but also a conch, a small shell or cockleshells (wisdomlib.org).
Johannes Schmidt (talk) 13:45, 1 March 2024 (EST)