Difference between revisions of "Graphite"
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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. | ||
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==Open issues== | ==Open issues== | ||
Revision as of 06:02, 9 March 2013
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.
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.
I want to express my tnkhas to you for bailing me out of this predicament. As a result of looking throughout the world wide web and coming across concepts which are not productive, I assumed my entire life was well over. Existing minus the solutions to the difficulties you have fixed all through your main article is a crucial case, and the ones that would have badly damaged my entire career if I had not come across your website. Your good skills and kindness in dealing with all things was very useful. I don't know what I would've done if I had not discovered such a step like this. I can also now look forward to my future. Thanks so much for your reliable and amazing guide. I won't hesitate to suggest the sites to any person who desires support on this area.
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
