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MOTHER COAL [1 record]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2012-03-01

English

Subject field(s)
  • Classification of Coal
  • Characteristics of Coal
DEF

Coal that absorbs rather than reflects light, containing mostly durain and fusain lithotypes.

OBS

An early division was into three types : bright coal, dull coal and mineral charcoal(or mother of coal). Another system [divided coal into] four types : fusain, durain, clarain, and vitrain. This coincided with the classification put forward by... the United States Bureau of Mines where coal is divided into anthraxylon-bright layers of plant material and attrius-darker debris material. Today coal classification is based on the organic material seen using different optical microscopic techniques. There are three main groups : liptinite(or exinite), vitrinite and inertinite with many further divisions [within these three groups].

French

Domaine(s)
  • Classification des charbons
  • Caractéristiques des charbons
DEF

Charbon lité de couleur grise et d'aspect mat.

OBS

Ce peut être soit du durain, soit un charbon à forte teneur en matières minérales.

Spanish

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