TERMIUM Plus®

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OPAQUE MINERAL [1 record]

Record 1 2006-11-15

English

Subject field(s)
  • Mineralogy
DEF

A mineral which transmits no light through a thin section under a microscope.

CONT

... the most plausible explanation of the opaque minerals is that they represent a metamorphosed primary magmatic assemblage modified by supergene alteration.

CONT

The opaque minerals in the basalt are predominantly titaniferous magnetite and ilmenite represented by a reticulated network of leucoxene lamellae. Other opaques are chrome spinel, pyrite with martite rims, chalcopyrite, and hematite.

OBS

[An opaque mineral is] usually a native metal, sulfide, or metallic oxide mineral.

OBS

As a noun, opaque is usually used in the plural.

OBS

opaques : term used at Natural Resources Canada - Earth Sciences Sector.

Key term(s)
  • opaques

French

Domaine(s)
  • Minéralogie
DEF

Minéral [pour lequel] la totalité de la lumière est réfléchie par la surface du spécimen.

CONT

Les minéraux opaques sont le plus souvent des minéraux accessoires et donc représentent normalement un petit pourcentage des minéraux ferromagnésiens.

CONT

Le fond microcristallin - la mésostase - est constitué des mêmes minéraux auxquels s'ajoutent des oxydes métalliques (les «opaques»). [...] Dans cette autre lave vitreuse, de minuscules cristaux de minéraux opaques marquent bien la «fluidalité» de la roche.

OBS

opaques (nom masculin pluriel) : terme en usage à Ressources naturelles Canada - Secteur des sciences de la Terre.

Key term(s)
  • opaques

Spanish

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