chvilevaite

{{Infobox mineral | name = Chvilevaite | category = Sulfide mineral | boxwidth = | boxbgcolor = | image = | imagesize = | caption = | formula = Na(Cu,Fe,Zn)2S4 or Na(Cu,Fe,Zn)2S2 | IMAsymbol= Cvi | molweight = | strunz = 2.FB.10 | system = Trigonal | class = Sulfide | symmetry = | color = bronze when freshly chipped, gradually blackening to sooty | habit = in the form of free grains and small aggregates | twinning = | cleavage = Perfect on {0001} | fracture = irregular to uneven | tenacity = | mohs = 3 | luster = metallic | polish = | refractive = | opticalprop = | birefringence = | dispersion = | pleochroism = distinct, from pale orange to dark gray with a lilac tint. | fluorescence= | absorption = | streak = | gravity = | density = 3.94 (calculated) | melt = | fusibility = | diagnostic = | solubility = | diaphaneity = opaque | other = | references = }} Chvilevaite (, in its own name) is a rare hydrothermal polymetallic mineral from the class of complex sulfides, forming microscopic grains in related minerals, its composition is a rare combination of alkali (combining lithophile) and chalcophile metals — sodium ferro-sulfide, zinc and copper with the calculation formula Na(Cu,Fe,Zn)2S4, originally published and confirmed as Na(Cu,Fe,Zn)2S2.

The new mineral was studied, described and identified in 1985-1986 and named in honor of Tatyana Chvileva, a leading employee of the Institute of Mineralogy, Geochemistry and Crystal Chemistry of Rare Elements, a mineralogist at the Mineragraphy Cabinet.