elba island — Photo: Westernelba · CC BY-SA 4.0
Celleriite
Celleriite is an IMA-recognized mineral species in the silicate class, with the chemical formula (Mn²⁺₂Al)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH).
It crystallizes in the hexagonal crystal system (space group R3m). It is a member of the Tourmaline structural group.
Key properties: Mohs hardness 7; specific gravity 3.13; White streak; Vitreous luster; optically uniaxial.
IMA symbol Cll, IMA status: approved, named in 2020.
Found in granitic LCT-type pegmatite. during the latest stage of evolution of pegmatite cavities after an event of a pocket rupture (Elba); in elbaite-subtype granitic pegmatite (Pikárec).
It is found associated with Quartz, albite, K-feldspar, lepidolite, pollucite, petalite, elbaite, fluor-elbaite, rossmanite, beryl, cassiterite, columbite-(Mn), “laumontite, ” “stilbite.
The mineral was named to honor Luigi G. Celleri (1828-1900), from San Piero in Campo, Italy, for contributions to the discovery of pegmatites during the second half of the 19th Century.