chaoite
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Chaoite, or white carbon, is a mineral described as an allotrope of carbon, whose existence is disputed. It was discovered in shock-fused graphite gneiss from the Ries crater in Bavaria. It has been described as slightly harder than graphite, with a reflection colour of grey to white. From its electron diffraction pattern, the mineral has been considered to have a carbyne structure, the linear acetylenic carbon allotrope of carbon. A later report has called this identification, and the very existence of carbyne phases, into question, arguing that the new reflections in the diffraction pattern
Key facts
- Mineral.name
- Chaoite
- Mineral.category
- Native element mineral
- Mineral.formula
- C
- Mineral.IMAsymbol
- Ch
- Mineral.strunz
- 1.CB.05b
- Mineral.system
- Hexagonal
- Mineral.class
- Dihexagonal dipyramidal (6/mmm) H-M symbol: (6/m 2/m 2/m)
- Mineral.symmetry
- P6/mmm
- Mineral.unit cell
- a = 8.948 Å, c = 14.078 Å; Z = 168
- Mineral.colour
- Black
- Mineral.habit
- Thin 3-15 μm intergrowth lamellae with graphite
- Mineral.mohs
- 1 - 2
- Mineral.lustre
- Submetallic
- Mineral.diaphaneity
- Opaque
- Mineral.gravity
- 3.43 (calculated)
via Wikipedia infobox
Wikidata facts
Show 4 more facts
- chemical formula
- C
- Nickel-Strunz '10th ed', review of (9th ed/ 2009 update)
- 1.CB.05b
- Nickel-Strunz 9th edition (updated 2009)
- 1.CB.05b
- IMA Mineral Symbol
- Ch
Sources (2)
via Wikidata · CC0
~2 min read
Article
5 sectionsContents
- Synthetic material
- Occurrence and discovery
- See also
- References
- Further reading
Chaoite, or white carbon, is a mineral described as an allotrope of carbon, whose existence is disputed. It was discovered in shock-fused graphite gneiss from the Ries crater in Bavaria. It has been described as slightly harder than graphite, with a reflection colour of grey to white. From its electron diffraction pattern, the mineral has been considered to have a carbyne structure, the linear acetylenic carbon allotrope of carbon. A later report has called this identification, and the very existence of carbyne phases, into question, arguing that the new reflections in the diffraction pattern are due to clay impurities.
==Synthetic material== It has been claimed that an identical form can be prepared from graphite by sublimation at 2700-3000 K or by irradiating it with a laser in high vacuum. This substance has been termed ceraphite.