bituminous coal close to anthracite - Hay Gulch Mine UNIT OF 5 STUDENT SPECIMENS

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Student specimens of high grade bituminous coal, almost anthracite, from the Hay Gulch Mine, Hesperus, Colorado
This bituminous coal is close to anthracite. It is highly prized for burning with very little ash. It has the hard shiny surface of anthracite, but not the conchoidal fracture. Coal forms from the burial of accumulated plant material, in a series with increasing compaction from peak to lignite to bituminous coal. These are all considered sedimentary. Anthracite has undergone low-grade metamorphism, burns hotter than other coals and with a clean blue flame. The name anthracite was derived from the Greek word
anthrax
, the name given to it by the philosopher Theophrastus, a pupil of Aristotle. Bituminous coal was named under the mistaken impression that it contained bitumen, a group of hydrocarbons including tar and asphalt.
This coal is Cretaceous in age, from the Menefee Formation of the Mesaverde Group. Hesperus is in the San Juan Basin, a major coal produci
ng area in southern Colorado and northern New Mexico.
You are buying a unit of five student specimens.
The photo is representative of what we ship.
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