TERMIUM Plus®

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AMYGDULE [3 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2012-10-04

English

Subject field(s)
  • Mineralogy
DEF

Secondary deposit of minerals found in a rounded, elongated, or almond-shaped cavity in volcanic rock.

CONT

When crystals form on the walls of a vesicle, it is then called an amygdaloid, or amygdale.

OBS

The cavities (vesicles) were created by the expansion of gas bubbles or steam within lava. Because gas bubbles tend to rise through the lava, amygdules are most common near the tops of flows. Many minerals have been found as amygdules, incluing some spectacular museum specimens of zeolites.

French

Domaine(s)
  • Minéralogie
DEF

Vacuole qui s'est remplie de minéralisations secondaires (zéolite, calcite, zoïsite, etc.) et dont la forme en amande donne aux laves une texture amygdalaire.

OBS

En français, les seules définitions trouvées pour «amygdale» en géologie avaient trait à la vacuole ou cavité en forme d'amande formée au sein de roches ignées qui dans une phase tardive se tapissait ou se remplissait de cristaux secondaires, et non à ce seul remplissage minéral. La relation entre les termes anglais amygdule/amygdale/amygdaloid (n.), au sens de "deposit of mineral" et le terme français en est donc une de contenu à contenant.

Spanish

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Record 2 2009-11-17

English

Subject field(s)
  • Petrography
  • Mineralogy
DEF

A gas cavity or vesicle, in an igneous rock that is filled with such secondary minerals as calcite, quartz, chalcedony, or a zeolite.

CONT

At some stage after lava has solidified, the vesicles may be filled by a variety of secondary minerals, especially calcite and zeolites. The infilled vesicles are referred to as amygdales ...

CONT

... the copper minerals fill intergranular spaces in clastic sedimentary host rocks, and spaces in the matrices of flow-top breccias and in amygdules in amygdaloidal flow tops.

OBS

The term amygdale is preferred in British usage.

OBS

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

French

Domaine(s)
  • Pétrographie
  • Minéralogie
DEF

Cavité en forme d'amande, fréquente dans les roches volcaniques, due à la présence de gaz et souvent tapissée de cristaux tardifs : zéolite, calcite, quartz.

CONT

Les basaltes et les andésites renferment du cuivre, qui peut s'exprimer dans des amygdales de la lave sous l'effet de solutions hydrothermales. [...] le cuivre [...] se concentre secondairement dans les vacuoles lors d'une phase d'altération hydrothermale.

CONT

Au sommet des coulées, se développe un faciès à amygdales, riche en cuivre. [...] Zéolites et zoïsite remplissent partiellement les amygdales.

OBS

amygdale : terme en usage à Ressources naturelles Canada - Secteur des sciences de la Terre.

Spanish

Campo(s) temático(s)
  • Petrografía
  • Mineralogía
DEF

Vacuola en forma de almendra creada en el seno de las rocas volcánicas por una burbuja de gas y que, posteriormente a su formación, se ha llenado de calcita, ceolita o de otros minerales secundarios.

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Record 3 1999-09-16

English

Subject field(s)
  • Petrography
  • Vulcanology and Seismology
DEF

An elongate amygdule that occurs in a lava, towards the base of the flow, probably formed by the generation of gases or vapor from the underlying material.

CONT

Occasionally elongated cylindrical cavities (pipe amygdales) occur at right angles to the surfaces of the lava flow. They are formed when lava flows over a patch of wet ground, e.g. a spring, the steam so evolved penetrating the lava, leaving tubes behind.

OBS

The term amygdale is preferred in British usage.

French

Domaine(s)
  • Pétrographie
  • Volcanologie et sismologie
CONT

[...] les amygdales tubulaires, emplies ou non de minéraux fumerolliens et formées lors du départ des gaz de la base de la coulée; les spiracles emplis de roches arrachées au substratum, sont asymétriques.

Spanish

Save record 3

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