What is Osbornite?
Osbornite is a very rare titanium nitride found in enstatite-rich meteorites, a mineral record of strongly reducing conditions in the early Solar System.
Mineralogy and crystal structure
Reference formula: TiN. Osbornite has a cubic TiN structure and is usually microscopic. Its existence in meteorites is more important than hand-specimen appearance, so authenticated provenance is essential. Osbornite is classified with nitrides and has a cubic crystal system. Typical hardness is 8–9 on the Mohs scale and specific gravity is approximately 5.2–5.4.
Colour, lustre and habit
Typical colours include brass-yellow, brown, black, metallic grey. The usual cubic, granular, massive habit and metallic lustre help describe a specimen, but colour alone is not diagnostic.
Formation and notable localities
Osbornite forms in or is associated with enstatite chondrites, meteorite inclusions and exceptionally reducing extraterrestrial environments. Important documented localities include Meteorites from Antarctica and other curated falls and finds studied in planetary laboratories.
A nitride forged in a reducing Solar System
Osbornite is a mineral from chemistry that Earth rarely permits. Its titanium-nitrogen lattice records oxygen-poor conditions in meteorite parent bodies and the earliest planetary materials.
Collecting and care
Keep in a labelled, dry micro-specimen container; never grind or inhale meteorite dust.
