Gratonite
(repeating unit)Pb9As4S15 IMA symbol Gtn[1] Strunz classification 2.JB.55 Crystal system Trigonal Crystal class Ditrigonal pyramidal (3m)
(same H-M symbol) Space group R3m
(same H-M symbol)
Gratonite is a lead-arsenic sulfosalt mineral, with the chemical composition Pb9As4S15. Gratonite was discovered in 1939 at the Excelsior Mine, Cerro de Pasco, Peru. It is named in honor of geologist L. C. Graton (1880–1970), who had a long-standing association with the Cerro de Pasco mines.
References
- ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- Mineral Data Publishing
- Webmineral
- Mindat
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