Orishchinite
Orishchinite is an IMA-recognized mineral species in the native element class, with the chemical formula Ni₂P.
It crystallizes in the orthorhombic crystal system (space group Pnma). It is a member of the Barringerite structural group.
Key properties: Mohs hardness 5–6; specific gravity 7.695; Metallic luster.
IMA symbol Orh, IMA status: approved, named in 2019.
Found in pyrometamorphic rocks, an accessory phase in fused clinopyroxene-plagioclase rock (paralava) texturally resembling gabbro-dolerite.
It is found associated with Allabogdanite, pyroxene, plagioclase, murashkoite, calcite.
The mineral was named to honor Stepan Vasil’ovich Orishchin (1955-2012), Soviet and Ukrainian crystal chemist, for his contributions to the crystal chemistry of phosphides, arsenides.