Rubinite
Rubinite is an IMA-recognized mineral species in the silicate class, with the chemical formula Ca₃Ti³⁺₂Si₃O₁₂.
It crystallizes in the cubic crystal system (space group Ia3d). It is a member of the Garnet structural group.
Key properties: specific gravity 3.63.
IMA symbol Rbi, IMA status: approved, named in 2017.
From Ca-Al-rich inclusions in carbonaceous chondrite meteorites. Among the first solid materials in the solar nebula formed either as a condensate or through crystallization from an 16 O-rich Ca, Al.
It is found associated with Zr-panguite, spinel, davisite-diopside, forsterite (Vigarano); gehlenitic melilite, perovskite, spinel, hibonite, corundum, davisite, grossmanite, diopside.
The mineral was named to honor Alan E. Rubin (b.1953), a cosmochemist at University of California, Los Angeles (UCLA), USA., for his contributions to cosmochemistry and meteorite research.