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Antras

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masculine noun (geology / mining)

Definition

An archaic or regional technical term used to describe an inferior variety of friable bituminous coal or fine coal dust sedimented in old extraction galleries, featuring a high content of mineral impurities and ash. In petrography, it can refer to microscopic fragments of carbonized organic matter dispersed in argillaceous sedimentary rocks, used as indicators of thermal metamorphism grade.

Bilingual Equivalents

  • Antras
  • Coal dust sediment

Grammatical & Source Details

Inflection Type Masculine noun, regular physical terminology variations.
Formation Obscure etymology, likely a regressive derivative or a simplified variant from the Greek root 'anthrax' (coal), entering through mining jargon.
Spelling / Pronunciation [an.ˈtras]
Source Glossary of Historical Mining Terms and Petrography

Contextual Usage Examples

RO: Straturile subțiri de antras descoperite în carieră indică o ardere incompletă a vegetației preistorice.

EN: The thin layers of antras discovered in the quarry indicate an incomplete burning of prehistoric vegetation.

RO: Minerii au curățat depunerile de antras acumulare pe pereții galeriei pentru a preveni riscul unei explozii de praf.

EN: The miners cleared the accumulated antras deposits on the gallery walls to prevent the risk of a dust explosion.

RO: Analiza microscopică a arătat că mostra conține antras amestecat cu particule fine de argilă și sulfură de fier.

EN: Microscopic analysis showed that the sample contains antras mixed with fine particles of clay and iron sulfide.

Idioms & Phrases

Depozit de antras / Antras deposit

RO: Acumulare sedimentară de cărbune fin și sfărămicios, localizată în bazinele tectonice de vârstă paleozoică.

EN: A sedimentary accumulation of fine, crumbly coal located in tectonic basins of Paleozoic age.

Antras friabil / Friable antras

RO: Varietate de material carbonos care se dezintegrează cu ușurință la atingere în particule microscopice.

EN: A variety of carbonaceous material that easily disintegrates upon touch into microscopic particles.

Incluziune de antras / Antras inclusion

RO: Fragment mic de cărbune blocat în interiorul unei roci sedimentare în timpul procesului de diageneză.

EN: A small fragment of coal trapped inside a sedimentary rock during the diagenesis process.

Keywords

#antras #geology #mining terminology #coal dust #sedimentary rock #petrography #carbonaceous matter #geological indicator
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