Abuite — Photo: Daisuke Nishio-Hamane · CC BY 4.0
Abuite
A colorless calcium-aluminium phosphate closely related to galliskiite, differing mainly in being hydrated.
Intro adapted from Wikipedia (CC BY-SA).
Abuite is an IMA-recognized mineral species in the phosphate class, with the chemical formula CaAl₂(PO₄)₂F₂.
It crystallizes in the orthorhombic crystal system (space group P2_12_12_1).
Key properties: specific gravity 3.214; White streak; Vitreous luster.
IMA symbol Abu, IMA status: approved, named in 2014.
Found in hydrothermally altered, felsic pyroclastic rocks, related to a biotite adamellite intrusion.
It is found associated with Quartz, augelite, and/or trolleite, apatite, crandallite.
The name is taken from the type locality, near the town of Abu, Abu County, Yamaguchi Prefecture, Japan.