Orange kolicite crystals from the type locality in Sterling Hill. Specimen found in 1979. — Photo: David Hospital · CC BY-SA 4.0
Kolicite
Kolicite is an IMA-recognized mineral species in the silicate class, with the chemical formula Zn₄Mn²⁺₇(AsO₄)₂(SiO₄)₂(OH)₈.
It crystallizes in the orthorhombic crystal system (space group Cmca).
Key properties: Mohs hardness 4.5; specific gravity 4.17; Light orange streak; Vitreous luster; optically biaxial.
IMA symbol Kol, IMA status: approved, named in 1978.
Incrusting willemite-franklinite ore from metamorphosed stratiform zinc orebodies.
It is found associated with Willemite, franklinite, sonolite, friedelite, holdenite, calcite.
The name refers to John Kolic, of Rockaway, New Jersey, USA, who first discovered the mineral.