Commodity Code

coal

http://resource.geosciml.org/classifier/cgi/commodity-code/coal

star this property definition Coal is a combustible black or brownish-black sedimentary rock composed primarily of carbon along with variable quantities of other elements, chiefly hydrogen, sulfur, oxygen, and nitrogen, derived from fossilized organic remains. Coal is subdivided in terms of rank. The hardest form or highest rank is anthracite coal, which can be regarded as metamorphic rock because of later exposure to elevated temperature and pressure. Intermediate rank coal is bituminous and low rank coal includes lignite. more like this
star this property narrower anthracite
star this property broader coal
black coal
star this property broader coal
brown coal
star this property broader coal
star this property notation
01.01.05.01.01 more like this
Coal more like this
star this property source http://en.wikipedia.org/wiki/Coal more like this
unstar this property type
Resource
Concept
star this property broader carbonaceous material
star this property narrower coal
star this property in scheme commodity code
star this property is primary topic of coal& properties=type