Coal is not a mineral because it is organic, and minerals are inorganic. Minerals have a repeating crystalline structure and a homogeneous chemical profile. Coal has neither. It forms over millions of years from the comp... More »

Proximate analysis reveals the quality and precise chemical composition of a coal sample. This analysis examines four factors: moisture, volatile compounds, ash content and fixed carbon. Information revealed during proxi... More »

Due to the wide variety in the composition of coal, its position on the Mohs hardness would vary based on the type of coal that is measured. However, because coal is not a mineral, it would not be measured using the Mohs... More » Science Earth Science Geology

Carbon monoxide is a poisonous gas that is produced from the incomplete burning of fossil fuels, such as coal, oil, wood, charcoal, kerosene, propane and natural gas. It is also produced by products that use internal com... More » Science Chemistry Organic Chemistry

Fossil fuels include oil, natural gas and coal. Coal is commonly extracted through deep mining, but surface mining is a less expensive alternative. Oil is reached through the drilling of nonporous rock barriers that trap... More » Science Chemistry Organic Chemistry

Estimates of the amount of time that fossil fuels, oil, coal and gas, may last differs based upon estimates of remaining reserves and the predicted rate of usage. The estimates change over time as new reserves are discov... More »

Synthetic, or human-made dyes, were originally derived from coal tar. Synthetic dyes have a wider and brighter color range, longer color permanence, and are faster, easier and cheaper to produce than natural dyes. There ... More »