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twinned crystal [2 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2004-12-15

English

Subject field(s)
  • Mineralogy
DEF

[An] intergrowth of two or more single crystals of the same mineral in a mathematically describable manner, so that some lattices are parallel whereas others are in reversed position.

French

Domaine(s)
  • Minéralogie
CONT

Les cristaux présentent entre eux des orientations variées, ou des aspects nouveaux qui paraissent être dus à l'accolement ou à l'interpénétration de deux cristaux identiques. Ces aspects nouveaux s'appellent macles.

CONT

La nature des cristaux [de ciment] formés et leur faculté de s'assembler en macles [...] ont une importance capitale au point de vue de la valeur des bétons.

Spanish

Campo(s) temático(s)
  • Mineralogía
DEF

Conjunto formado por dos o más cristales que han crecido unidos, dispuestos simétricamente respecto a una cara común [...]

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Record 2 2004-05-17

English

Subject field(s)
  • Gemmology
  • Diamond Industry
DEF

A characteristic of some rough diamonds; two crystals that are bonded along a seam and rotated 60° to one another; inclusions are normally trapped along the seam; also referred to as twinning.

CONT

Crystal distorted at the atomic level early in its growth as a result of changes in the orientation of atoms; as atoms continue to attach themselves to the re-oriented segment, another crystal begins to form, intergrown with the first. Twin crystals can be made up of two or more such intergrown crystals holding planes of atoms in common.

CONT

Seam line along which twinned crystal is formed.

French

Domaine(s)
  • Gemmologie
  • Industrie diamantaire
CONT

Jonction le long de laquelle le cristal maclé est formé.

Spanish

Save record 2

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