Anthracite differs from ordinary bituminous coal by its greater hardness (2.75–3 on the Mohs scale), its higher relative density of 1.3–1.4, and luster, which is often semi-metallic with…

Coal mine

Anthracite is the least plentiful form of coal. In the United States it is found mostly in northeastern Pennsylvania and makes up less than 2 percent of all…

Coal mine

Prices for coal picked up at the breaker (this is where the coal is processed into the size for the various types of coal burning appliances) range from…

Coal mine