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GREEN CHALCEDONY [2 records]

Record 1 2022-11-14

English

Subject field(s)
  • Gemmology
CONT

Black chalcedony is a microcrystalline or cryptocrystalline quartz. Chalcedony can have different colors like greenish blue, brownish orange, yellowish green, and greenish blue. Pure black is rare.

OBS

black onyx: incorrect name for black single colored agate or chalcedony which is usually colored artificially.

French

Domaine(s)
  • Gemmologie
CONT

Parfois, lorsque l'on pense acheter de l'onyx, on nous donne souvent, par escroquerie ou simple ignorance, des pierres de calcédoine teintes en noir. Il est cependant facile de distinguer ces matériaux en les plaçant devant une lumière forte : l'onyx naturel présente une légère translucidité brune, tandis que la calcédoine noire est totalement opaque.

Spanish

Save record 1

Record 2 2001-08-02

English

Subject field(s)
  • Mineralogy
DEF

A green gem cut from variscite and its surrounding matrix of gray, reddish, or brownish crystalline quartz or chalcedony.

French

Domaine(s)
  • Minéralogie

Spanish

Save record 2

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