TERMIUM Plus®

The Government of Canada’s terminology and linguistic data bank.

NEEDLELIKE CRYSTAL [3 records]

Record 1 2012-03-06

English

Subject field(s)
  • Mineralogy
DEF

The characteristic or typical crystal form, combination of forms, or other shape of a mineral, including irregularities.

CONT

Crystal Habit. The characteristic crystal shape (for example: platy, equant, granular, cubic, stubby, lath shaped, tabular, columnar, pyramidal, prismatic, blade-like, needle-like) of a mineral is its habit.

CONT

Some hematite and martite has a strong euhedral fine grained habit. The equigranular mineral habit in this type of ore usually gives well segregated silica and iron-oxide grains ...

OBS

Examples of crystal or mineral habits are acicular(needlelike), tabular(broad and flat), fibrous(hairlike), or prismatic(elongated in one direction). Aggregates of crystals may possess the following habits : botryoidal(grapelike), dendritic(arborescent), or reniform(kidney-shaped).

OBS

Many minerals may be found in more than one habit ... For example, galena may be found in euhedral crystals or in a massive/granular form, and malachite is usually botryoidal ... but may also be fibrous or stalactitic.

French

Domaine(s)
  • Minéralogie
DEF

Prédominance pour un minéral d'une forme cristallographique.

CONT

Tout minéral est caractérisé par un ou plusieurs «habitus» qui sont les formes les plus couramment rencontrées.

CONT

L'aspect extérieur des minéraux, lorsqu'ils sont normalement développés, est celui de solides géométriques dont l'aspect est caractéristique.

CONT

Certains minéraux présentent un faciès cristallographique, un «habitus» comme disent les minéralogistes anglo-saxons [...] variable suivant les conditions de genèse [...] Sans être un thermomètre géologique rigoureux, cet habitus est donc indicatif des conditions de genèse.

Spanish

Campo(s) temático(s)
  • Mineralogía
DEF

Forma simple o compuesta característica de los cristales de un mineral.

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Record 2 2011-01-24

English

Subject field(s)
  • Atmospheric, Climatic and Meteorological Phenomena
DEF

A slender needlelike snow crystal usually composed of needlelike components lying parallel, with the length of the crystals being at least five times greater than the diameter.

French

Domaine(s)
  • Phénomènes météorologiques, climatiques et atmosphériques
DEF

Cristal de neige en forme de prisme hexagonal très allongé (8 à 20 fois plus long que large).

OBS

L'allongement est parallèle à l'axe hexagonal (0001). Les aiguilles ont parfois un bout pointu, un autre creux, le plus souvent deux bouts creux; [...]

Spanish

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Record 3 2004-07-26

English

Subject field(s)
  • Mineralogy
CONT

Actinolite is a variety of asbestos, occurring in long, slender, needle-like crystals and also in fibrous, radiated, or columnar forms in metamorphic rocks ...

OBS

acicular : Said of a crystal that is needlelike in form.

French

Domaine(s)
  • Minéralogie
CONT

Actinolite. [...] Elle est isomorphe avec la trémolite et se présente en forme de cristaux aciculaires. Certaines variétés fibreuses sont appelées asbeste ou amiante.

Spanish

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