slavikite Min.
(ˈslævɪkaɪt)
[ad. Czech. slav{iacu}kit (Jirkovsk{yacu} & Ulrich 1926, in Věstn{iacu}k Státn{iacu}ho Geol. {Uacu}stavu Česk. Repub. II. 345), f. the name of František Slav{iacu}k (1876–1957), Czech mineralogist: see -ite1.]
A trigonal greenish-yellow hydrated basic sulphate of ferric iron found as an oxidation product of pyrite and usu. containing additional magnesium and sodium.
| 1927 Mineral. Abstr. III. 365 This mineral, named slav{iacu}kite (after the abstractor), forms minute, almost microscopic, crystals with the rhombohedron (1011) and the base (0001) equally developed, or tabular parallel to (0001). 1957 Ibid. XIII. 369 Slavikite..associated with gypsum, pickeringite, and jarosite, occurs in Belgium at Stavelot on Revinian phyllites and at Val-Dieu on Famennian sandstone. 1968 I. Kostov Mineral. 500 Slavikite is trigonal, found in minute uniaxial negative crystals tabular on {ob}0001{cb}. |