Coal

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Rock class: Organogenic Sedimentary Rock
Composition: Mainly composed of Carbon, Hydrogen and Oxygen, with some sulfur and nitrogen.
Luster: Hardness (Moh's Scale): 2 which is less than anthracite which has a hardness of 2-2 1/2
Color: Black
Uses: Coal is the most abundant and important fossil fuel of the world. Bituminous is the most abundant of the types of coal and has the highest amount of potential energy.
Comments: There are two main types of coal, Anthracite and Bituminous. Anthracite coal has a vitreous (glassy) luster whereas Bituminous is dull. Anthracite is slightly harder than bituminous (2.5 compared to 2). Anthracite has conchoidal fracture whereas Bituminous coal is uneven or splintery. Bituminous coal burns with a yellow flame and gives off smoke with a bituminous (fowl) odor. [coalWY.jpg]

Rock class:	Organogenic Sedimentary Rock
Composition:	Mainly composed of Carbon, Hydrogen and Oxygen, with some sulfur and nitrogen.
Luster:	Hardness (Moh's Scale): 2 which is less than anthracite which has a hardness of 2-2 1/2
Color:	Black
Uses:	Coal is the most abundant and important fossil fuel of the world. Bituminous is the most abundant of the types of coal and has the highest amount of potential energy.
Comments:	There are two main types of coal, Anthracite and Bituminous. Anthracite coal has a vitreous (glassy) luster whereas Bituminous is dull. Anthracite is slightly harder than bituminous (2.5 compared to 2). Anthracite has conchoidal fracture whereas Bituminous coal is uneven or splintery. Bituminous coal burns with a yellow flame and gives off smoke with a bituminous (fowl) odor.