Minerals described in 1817

thumb|alt=text|Vivianite from South Dakota, US thumb|alt=text|Vivianite and childrenite from the [[Siglo XX mine (tin mine in Bolivia)]] thumb|alt=text|Vivianite from Bavaria (Germany) thumb|alt=text|Vivianite and albite from Brazil

Eulytine ( from , fusible, easily dissolved) or bismuth blende (obsolete) is one of the rarest minerals in nature. The composition is bismuth silicate with the calculation formula Bi4(SiO4)3 or Bi4Si3O12. The mineral forms isometric cubic crystals up to 2 mm in size, the supporting form of which is a tetrahedron or tristetrahedron. Among the varieties, there are also often concentric, fibrous or spherical aggregates of a very impressive appearance, which were previously called agricolites.