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METHODE VERNEUIL [1 record]

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Record 1 1979-04-04

English

Subject field(s)
  • Precious Stones (Mining)
  • Gemmology
DEF

a procedure for growing large crystals (as of sapphire, ruby, spinel, or rutile) by adding the powdered material to the top of a rod the end of which is maintained at or close to the melting point by a flame directed vertically downward upon it.

French

Domaine(s)
  • Exploitation de pierres précieuses
  • Gemmologie
CONT

[...] comme il existe déjà bien assez de confusion dans la nomenclature des pierres véritables, il importe de s'en tenir strictement [...] pour ces dernières aux dénominations minéralogiques et de grouper tous les produits industriels dus au procédé Verneuil sous la même rubrique «synthétique»; [...]

OBS

Le Français A.V.L. Verneuil réussit, en 1902, à faire le synthèse du saphir et du rubis, par un procédé de fusion qui porte son nom et que l'on emploie encore aujourd'hui.

Spanish

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