Boghead Coal


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boghead coal

[′bäg‚hed ‚kōl]
(geology)
Bituminous or subbituminous coal containing a large proportion of algal remains and volatile matter; similar to cannel coal in appearance and combustion.

Boghead Coal

 

a variety of saprolitic coals, formed from water plants. Boghead coal is black-brown, occasionally olive, with a solid, fine-grained structure and shellshaped fracture planes. It is characterized by a high hydrogen content (8 to 12 percent), volatile substances (75 to 90 percent), and a large yield of primary resin (to 50 percent). The calorific value of a burning mass is 33.5–37.7 megajoules per kg (8,000–9,000 kilocalories per kg). The formation of boghead coal takes place under the conditions present in a stagnant reservoir of a lake or lagoon. Boghead coal lies in lenticular layers of comparatively limited distribution (the Podmoskovnii basin). Boghead coal is a valuable raw material for producing artificial liquid fuel, lubricating substances, and valuable resin free of phenols and asphaltenes. Easily hydrolyzed, it forms oil rich in cyclic hydrocarbons.

References in periodicals archive ?
The massive boghead coal appears to have been particularly suitable for carving delicate ornaments and figurines, such as the artifact described here and the beads and the possible labret found in the Bache Peninsula region of Ellesmere Island.