fluor-adeliten.
/flʊəˈradᵻlʌɪt/, /flɔːˈradᵻlʌɪt/, /flʊəˈradl̩ʌɪt/, /flɔːˈradl̩ʌɪt/, U.S. /flʊˈrædlˌaɪt/, /flɔˈrædlˌaɪt/ Mineralogy. Now rare.
The mineral tilasite; an adelite in which much of the hydroxyl is replaced by fluorine.
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the world > the earth > minerals > types of mineral > arsenates > [noun] > others of two plus elements
kœttigite1850
synadelphite1892
retzian1895
fluor-adelite1897
tilasite1897
schallerite1925
smolyaninovite1957
talmessite1961
1897 Jrnl. Chem. Soc. 72 ii. 325 Tilasite or fluor-adelite from Långban... Irregular grains of this new mineral are found with hausmannite, berzeliite and calcite in a grey limestone.
1899 E. S. Dana J. D. Dana's Syst. Mineral. (new ed.) App. 1 See also Tilasite, which is a fluor-adelite.
1939 G. Letchworth Descriptive List New Minerals 1892–1938 83 Fluor-adelite... Same as tilasite.
This is a new entry (OED Third Edition, March 2012; most recently modified version published online March 2022).
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n.1897