Wulffite

It was named for Russian crystallographer Georgiy Viktorovich Wulff, a renowned expert who furthered X-ray diffraction and interference.

It has been recorded as associated with hematite, langbeinite, calciolangbeinite, arcanite, krasheninnikovite, lammerite, labberite-β, johillerite, bradaczekite, urusovite, fluoborite, gahnite, orthoclase, and fluorophlogopite.

The analysis showed that wulffite has an orthorhombic crystal system structure with a basic unit of a heteropolyhedral quasi-framework formed from Cu-O-S chains.

From chemical and optical properties, the tests also showed how the chains run along the [010] with a center of copper pyramids and SO4 tetrahedra.

With the distinctive chemical banding missing and the specific environment in which they form, making wulffite a good index mineral.