Graphite: Difference between revisions
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'''Graphite''' is a form of high-purity [[carbon]] which occurs on Earth as a [[mineral]]. It can also be artificially produced from [[silicon carbide]].<br /> | '''Graphite''' is a form of high-purity [[carbon]] which occurs on Earth as a [[mineral]]. It can also be artificially produced from [[silicon carbide]].<br /> | ||
[[Coke]] and [[charcoal]] are not as pure as graphite because, while the carbonizing process does boil off [[volatiles]] in their production, non-volatile ash remains. | [[Coke]] and [[charcoal]] are not as pure as graphite because, while the carbonizing process does boil off [[volatiles]] in their production, non-volatile ash remains. In a Martian settlement it could be useful as part of the [[soil]] in the [[greenhouse]] and for filters in life support systems. | ||
==Physical characteristics== | ==Physical characteristics== | ||
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Graphite occurs on Earth in [[igneous rock|igneous]] and [[metamorphic rock]], sometimes as metamorphosed [[coal]]. It can also be found in [[limestone]]. Some [[meteorites]] contain graphite. | Graphite occurs on Earth in [[igneous rock|igneous]] and [[metamorphic rock]], sometimes as metamorphosed [[coal]]. It can also be found in [[limestone]]. Some [[meteorites]] contain graphite. | ||
==Uses== | |||
* [[Refractory]] | |||
* [[Graphene]] production | |||
* [[Carbon nanotube]] production | |||
==Open issues== | ==Open issues== | ||
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<references /> | <references /> | ||
[[Category: | [[Category:Materials]] | ||
Latest revision as of 00:48, 18 December 2018
Graphite is a form of high-purity carbon which occurs on Earth as a mineral. It can also be artificially produced from silicon carbide.
Coke and charcoal are not as pure as graphite because, while the carbonizing process does boil off volatiles in their production, non-volatile ash remains. In a Martian settlement it could be useful as part of the soil in the greenhouse and for filters in life support systems.
Physical characteristics
Graphite has a hardness of 1 to 2 on Mohs' scale, a black streak, a lustre varying from metallic to dull and earthy, a hexagonal crystal system and specific gravity between 2.1 and 2.23.[1]
Occurence
Graphite occurs on Earth in igneous and metamorphic rock, sometimes as metamorphosed coal. It can also be found in limestone. Some meteorites contain graphite.
Uses
- Refractory
- Graphene production
- Carbon nanotube production
Open issues
- How common are graphitic rocks on Mars?
- How common are graphite-containing meteorites on Mars?
References
- ↑ B. Cairncross - Field guide to rocks and minerals of Southern Africa 2004. ISBN 978-1-86872-985-2 p. 123