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MACLAGE [5 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2015-04-17

English

Subject field(s)
  • Mineralogy
  • Gemmology
DEF

A phenomenon in the formation of crystals whereby one crystal gives rise to two coupled or overlapping crystals known as twins, most often growing from a common face. These become symmetrical and the two crystals resume a single growth pattern.

French

Domaine(s)
  • Minéralogie
  • Gemmologie
DEF

Phénomène apparaissant dans la formation des cristaux et donnant naissance au sein du même cristal à deux individus (dits macles) accolés ou imbriqués et qui présentent le plus souvent une face commune de croissance. Une opération de symétrie ramène les deux individus à un modèle de croissance unique.

CONT

Formation de macles dans un réseau cristallin.

Key term(s)
  • formation de macle

Spanish

Save record 1

Record 2 1998-11-16

English

Subject field(s)
  • Mineralogy
DEF

Successive twinning of three or more individuals according to the same twinning law and with the composition planes parallel. Often revealed by striated surfaces.

French

Domaine(s)
  • Minéralogie
CONT

[...] dans le cas des feldspaths plagioclases, où l'on a une série d'individus qui se répètent identiques à eux-mêmes une fois sur deux; dans ce cas plus précis on pourra parler de macles polysynthétiques.

Key term(s)
  • maclage polysynthétique

Spanish

Save record 2

Record 3 1997-09-10

English

Subject field(s)
  • Metallography
DEF

A term used in reference to the special form of slip which may occur in the plastic deformation of metals. It can occur by movement in the same direction on a number of adjacent slip planes in which the distance moved by atoms on each successive plane is greater, by a constant amount, than on the previous plane.

French

Domaine(s)
  • Métallographie
OBS

macle : Assemblage régulier de deux ou plusieurs individus cristallins de même nature (...) Les macles peuvent être produites par une action mécanique.

Spanish

Save record 3

Record 4 1997-05-21

English

Subject field(s)
  • Metallurgy - General
DEF

Bands across a crystal grain, observed on a polished and etched section, where crystallographic orientations have a mirror-image relationship to the orientation of the matrix grain across a composition plane that is usually parallel to the sides of the band.

Key term(s)
  • twin band

French

Domaine(s)
  • Métallurgie générale
DEF

Bande correspondant à une région maclée et révélée par un polissage suivi d'une attaque appropriée.

Spanish

Save record 4

Record 5 1996-07-25

English

Subject field(s)
  • Semiconductors (Electronics)

French

Domaine(s)
  • Semi-conducteurs (Électronique)
OBS

Se dit des cristaux.

Spanish

Save record 5

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