In 1817, Breithaupt made a third description using Abraham Gottlob Werner's new mineralogical system, called or «arsenic-bismuth» (German: Arsenik-Wismuth).

It has the following characteristics: dark hairy brown color, variously shaped and formed small balls and hemispheres.

The fracture is vaguely conchoidal, diverges into tufts and asterisks of “small cracks,” but also encounters dense, uneven areas.

<...> Arsenic-bismuth <(German: Arsenik-Wismuth)> is very similar in appearance to radiated blende , but is always very different from it in color, softness, etc.”[6] The above passage represents the first documented description of eulytine, and the name of this mineral was in one chapter of this publication, as if having nothing to do with arsenic-bismuth, and the above text (with a description of the previously unknown “Arsenik-Bismuth”) was in another.

Finally, after a short pause of sound reflection, Breithaupt accepted the identity of all three of their described minerals: eulytine, bismuth blende and arsenic-bismuth.

Vladimir Vernadsky considered eulytine to be one of the problem areas of contemporary mineralogy and classified it as “earthy, little studied bodies”, the further modifications and further metamorphism of which are unknown.

As he believed, the transition of bismuth to eulytite requires further study and confirmation, and an indication of it could go to all mineralogical catalogs solely thanks to Breithaupt's description.

In the Caucasus, the mineral is found in albitized pegmatites in the form of tetrahedral crystals and crusts around tantalum grains.

[7] The type deposit of eulytine is located in Saxony (Schneeberg, Johanngeorgenstadt); in Germany this mineral was later discovered in Höchstberg, near Hausach, and in the Clara mines near Oberwolfach, Black Forest.

Due to the complexity of growing eulytine single crystals from a high-viscosity melt, their production represents an important and promising technological problem, which several research teams worked on in the 2010s.