| Mineral/rock | Derived from or for | | Faujasite (zeolite) | Barthélemy Faujas de Saint Fond (1741-1819), French geologist | | Fayalite | locality at Fayal Island in the Azores and Greek lithos = stone | | Feitknechtite | for Walter Feitknecht (1899- ), University of Bern, who first synthesized the compound
| | Feldspar | Swedish feldt or fält = field and spat = spar, for the spar in the tilled fields overlying granite | | Fergusonite | Robert Ferguson (1799-1865), Scottish physician | | Ferrierite (zeolite) | Walter Frederick Ferrier (1865-1950), Canadian geologist and moning engineer | | Ferronatrite | Latin ferrum = iron and natrium = soda describing its composition | | Flint | Greek plinthos = a brick | | Florencite | Willian Florence (1964-1942), Brazilian mineralogist who studied minerals in Minas Gerais | | Fluoborite | from composition, a fluoborate of magnesium | | Fluocerite | containing fluorine and cerium named for Ceris, an asteroid | | Fluorapatite | containing fluorine and apatite | Sources: Fleischer, M, 1975, Glossary of Mineral Species; Lyman, K., ed., 1984, Simon & Schuster's Guide to Gems and Precious Stones; Mitchell, R.S., 1979, Mineral Names What Do They Mean?; Spencer, L.J., M.H. Hay, et al, various dates, "Annual lists of new mineral names", Mineralogical Magazine; Chambers Etymological English Dictionary; Encyclopaedia Britannica; Webster's New Twentieth Century Dictionary (unabridged).
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