Osbornite

General
Category| Mineral
Formula
(repeating unit)| TiN
Strunz classification| 1.BC.15
Dana classification| 1.1.19.1
Crystal system| isometric
Space group| Fm3m
Unit cell| a = 4.24173 Å Z=4 V=76.32 Å3
Structure
Identification
Formula mass| 61.874
Colour| golden yellow
Tenacity| brittle
Mohs scale hardness| 8.5
|re|er}}| metallic
Streak| yellow
Diaphaneity| opaque
Density| 5.24 g/mL
Melting point| 2930 °C

Osbornite is a naturally occurring variety of titanium nitride. It was first discovered in the Bustee meteorite in the late nineteenth century.[1] Its crystals are golden-yellow octahedrons, combined with oldhamite. It is friable and does not dissolve in acids.[2]

Osbornite is usually found only in meteorites, but osbornite of terrestrial origin has been found in one location in the continental collision zone of Tibet. Osbornite requires extraordinarily low redox potential and very high temperatures (2500–3000 K) to form.[3]

## References

1. ↑ Carr, L. P.; Pillinger, C. T.. "Nitrogen Isotopic Composition of Osbornite from the Bustee Meteorite". Lunar and Planetary Science XV: 129–130. Bibcode: 1984LPI....15..129C. http://adsabs.harvard.edu/full/1984LPI....15..129C.
2. ↑ E.L. Krinov (1960). Principles of Meteorics. Pergamon Press. p. 335.
3. ↑ G. Parthasarathy (Aug 2016). "Osbornite (TiN): Implications for an extraterrestrial origin of carbonado- diamonds". https://www.researchgate.net/publication/314359536_Osbornite_TiN_Implications_for_an_extraterrestrial_origin_of_carbonado-_diamonds.

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