Allendeite
Allendeite, Sc4Zr3O12, is an oxide mineral. Allendeite was discovered in a small ultrarefractory inclusion within the Allende meteorite. This inclusion has been named ACM-1. It is one of several scandium rich minerals that have been found in meteorites. Allendeite is trigonal, with a calculated density of 4.84 g/cm3. The new mineral was found along with hexamolybdenum. These minerals, are believed to demonstrate conditions during the early stages of the Solar System, as is the case with many CV3 carbonaceous chondrites such as the Allende meteorite.
Intro adapted from Wikipedia (CC BY-SA).
Allendeite is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula Sc₄Zr₃O₁₂.
It crystallizes in the hexagonal crystal system (space group R-3).
Key properties: specific gravity 4.84.
IMA symbol Aed, IMA status: approved, named in 2007.
Occurs as grains in an ovoid-shaped, ultra-refractory inclusion in the Allende meteorite, likely a high-temperature condensate early in the formation of the solar system.
It is found associated with Perovskite, Os-Ir-Mo-W alloys, Sc-stabilized tazheranite (cubic zirconia).
The name refers to the meteorite that contained the first specimens.