TERMIUM Plus®

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BALLAS [3 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2015-04-21

English

Subject field(s)
  • Economic Geology
  • Mineralogy
  • Ground-Drilling Facilities (Mining)
DEF

Cryptocrystalline material composed of diamond. It is compact, opaque, dark gray to black, lacking cleavage planes and very tough. Usually occurs in rounded masses, but is also found in angular broken pieces. Principal source is the State of Bahia, Brazil, but it occurs occasionally elsewhere in South America and in Africa. It was formerly in demand for diamond-drill bits.

French

Domaine(s)
  • Géologie économique
  • Minéralogie
  • Installations de forage minier
DEF

Variété impure de diamant noir, employé comme abrasif.

CONT

Plusieurs variétés de diamant peuvent être distinguées : 1) le diamant [...] 2) le ballas ou short bort [...] 3) le carbonado, fragments noirs, grenus à compacts, de la grosseur d’un pois et d’aspect de coke.

CONT

Le bort et le carbonado ont des applications [...] importantes pour leur dureté (têtes de forages et abrasif). Ce sont eux qui l’emportent sur le plan industriel.

Key term(s)
  • diamant noir industriel

Spanish

Save record 1

Record 2 2004-04-23

English

Subject field(s)
  • Gemmology
  • Diamond Industry
DEF

A diamond usually unsuitable for gem purposes, because of flaws or poor colour, and which is, therefore, used industrially because of its superior hardness over all other materials.

CONT

Industrial diamonds constitute 80% of the production and include poor-quality diamonds, those that are too small, badly crystallized, cryptocrystalline, awkwardly twinned, or of dark colour (yellowish, brown or black). Ballas, carbonado and bort are industrial diamonds.

CONT

Industrial diamonds are diamonds that do not meet the standards of gem-quality diamonds because of their colour, clarity, size, or shape. Industrial diamonds include natural and synthetic diamonds.

French

Domaine(s)
  • Gemmologie
  • Industrie diamantaire
DEF

Diamant de piètre qualité, inutilisable en joaillerie, mais servant à des fins industrielles.

CONT

Les diamants industriels constituent 80 % de la production et comprennent les diamants de pauvre qualité, ceux qui sont trop petits, mal cristallisés, cryptocristallins, bizarrement maclés ou de couleurs foncées(jaunâtres, brunâtres, ou noirs). Le ballas, la carbonado et le bort sont des diamants industriels.

CONT

Les diamants industriels sont les diamants qui ne répondent pas aux normes des diamants de joaillerie en raison de leur couleur, leur pureté, leur dimension et leur forme. Ils comprennent les diamants naturels et les diamants synthétiques.

Spanish

Save record 2

Record 3 1998-02-04

English

Subject field(s)
  • Mineralogy
  • Gemmology
DEF

A hard, spherical aggregate of many very small diamond crystals, usually cryptocrystalline, arranged radially and more or less concentrically around a central point. Because of their structure, ballas are classed as industrials, which are occasionally used in diamond-drill bits and other diamond tools. Also incorrectly used as a name applied to rounded, single-crystal forms of diamond.

French

Domaine(s)
  • Minéralogie
  • Gemmologie
DEF

Variété de bort.

CONT

Plusieurs variétés de diamant peuvent être distinguées : 1) le «diamant» [...] 2) le «ballas» ou «shot bort», masses sphériques, irrégulières, fibroradiées; 3) le «carbonado» [...]

Spanish

Save record 3

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