What is the hardness of coal?

Answer

The hardness of coal is measured using the Mohs Scale. The common coal that is used in industry is called Anthracite coal. Coal consists of up to 87 percent carbon. It is expected that it would have a Mohs' hardness range of more than 3.0 but less than 4.0. The reason for the range is due to the fact that coal is a rock and each piece will have a different amount of carbon. The Mohs Scale of Hardness measures minerals from a scale of 1 for very soft minerals to 10 for very hard minerals.
Reference:
Q&A Related to "What is the hardness of coal?"
5.5 is the hardness of bituminous!
http://wiki.answers.com/Q/What_is_the_hardness_of_...
Hard coal - a hard natural coal that burns slowly and gives intense
http://www.chacha.com/question/what-are-hard-coals
What do you mean like CORE samples of COAL?
http://answers.yahoo.com/question/index?qid=201003...
Woodshop Films
http://www.imdb.com/title/tt1334002
Explore this Topic
I would rank the hardness of a penny on the Mohs scale of hardness at about a 3. It is harder than gypsum, but less than fluorite. The real number is between 3.2 ...
The hardness of Anthracite coal is due to the coal consisting to around 87% of carbon. Anthracite coal is the topped ranked coal and is valued as being the highest ...
Coal mining hard hats are worn by miners when working in coal mines. Some of the hard hats are equipped with a light that is attached to the front of the hat. ...
About -  Privacy -  AskEraser  -  Careers -  Ask Blog -  Mobile -  Help -  Feedback © 2014 Ask.com