Addibischoffite
Addibischoffite is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula Ca₂Al₆Al₆O₂₀.
It crystallizes in the triclinic crystal system (space group P-1). It is a member of the Sapphirine structural group.
Key properties: specific gravity 3.41.
IMA symbol Add, IMA status: approved, named in 2015.
Found in the core of a Ca-Al-rich inclusion (CAI) in the Acfer 214 CH3 carbonaceous chondrite meteorite, presumably a refractory phase from the solar nebula.
It is found associated with Hibonite, perovskite, kushiroite, Ti-kushiroite, spinel, melilite, anorthite, FeNi-metal.
The mineral was named to honor Addi Bischoff (b. 1955), cosmochemist at University of Münster, Germany, for his many contributions to the mineralogy of carbonaceous chondrites.