White acicular crystals of the very rare calcium beryllium phosphate mineral uralolite from one of the few localities known worldwide (Eitzing Quarry, Waldkirchen, Bavaria, Germany). — Photo: David Hospital · CC BY-SA 4.0
Uralolite
Uralolite is an IMA-recognized mineral species in the phosphate class, with the chemical formula Ca₂Be₄(PO₄)₃(OH)₃·5H₂O.
It crystallizes in the monoclinic crystal system (space group P2_1/n).
Key properties: Mohs hardness 2.5; specific gravity 2.05–2.14; Vitreous, silky for fibrous aggregates luster; optically biaxial.
IMA symbol Url, grandfathered status — known before the IMA’s founding, named in 1964.
Found in complex zoned granite pegmatites (Boevskoye deposit, Russia; Dunton quarry, Maine, USA); in a spodumene-rich pegmatite in high-grade metamorphic rocks (Weinebene Pass, Austria).
It is found associated with Moraesite, beryllonite, apatite, carbonate-apatite, crandallite, beryl, fluorite (Boevskoye deposit, Russia); roscherite, hydroxyl-herderite, elbaite.
The name refers to the Ural Mountain region, Russia, in which it was first found.