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INDEFINITE FORM [4 records]

Record 1 2011-06-14

English

Subject field(s)
  • Mineralogy
  • Geochemistry
DEF

A mineral of a class of polymeric silicates in which the silicon-oxygen tetrahedral groups are linked by sharing three of every four oxygen atoms so as to form sheets of indefinite extent, in which the rate of silicon to oxygen is 2 : 5, and in which some silicon atoms may be replaced by aluminum(as in mica, chlorite, kaolinite).

CONT

Phyllosilicates are generally flaky, soft, and of low density. They form at relatively low temperatures and may replace earlier minerals as a result of alteration. They are a major constituent of fine-grained, argillaceous rocks and of some metamorphic rocks.

OBS

The term physil, an abbreviated form of phyllosilicate, is proposed to describe all sheet, silicate minerals regardless of grain size.

French

Domaine(s)
  • Minéralogie
  • Géochimie
DEF

Silicate à structure en feuille dans lequel trois des quatre atomes d'oxygène de chaque tétraèdre se partagent avec les tétraèdres voisins.

CONT

Les phyllosilicates présentent un clivage parfait; ils ont une structure atomique lamellaire où le feuillet est constitué par des tétraèdres [de silice] dont les bases sont au contact et disposés aux sommets d'hexagones réguliers.

CONT

Les phyllosilicates [...] sont formés de couches de tétraèdres unis par trois de leurs sommets et formant un réseau plan à maille hexagonale [...], structure qui leur confère un clivage facile. Ce sont en général des minéraux lamellaires ou fibreux : micas, talc, minéraux argileux [...]

Spanish

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Record 2 1986-06-06

English

Subject field(s)
  • Language (General)
CONT

A description may be of two sorts, definite and indefinite(or ambiguous).... a definite description is a phrase of the form "the so-and-so".(Russell, Bertrand, Descriptions, in Semantics & the Philosophy of Language, edited by L. Linsky, Chicago, University of Illinois Press, 1952).

French

Domaine(s)
  • Linguistique (Généralités)
CONT

Description désignant un individu déterminé. [...] une description est définie quand elle désigne un individu déterminé : «la fille de ma voisine», «la porte de Saint-Denis».

Spanish

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Record 3 1976-06-19

English

Subject field(s)
  • Plant and Crop Production
CONT

the scab lesions are dark olive-green, velvety, of indefinite form

French

Domaine(s)
  • Cultures (Agriculture)
CONT

Les invasions de printemps, se manifestent [...] à la face supérieure du limbe [...] petites taches fumeuses de 4 à 6 mm de diamètre, à bords irréguliers [...]

Spanish

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Record 4 1976-06-19

English

Subject field(s)
  • Household Articles - Various
  • Table Setting (General)
DEF

A musical percussion instrument of indefinite pitch usually made of a rod of steel bent into the form of a triangle open at one angle and sounded by striking with a small metal rod.

DEF

A similar piece of metal used in the same way as an instrument of call.

French

Domaine(s)
  • Articles ménagers divers
  • Service de table (Généralités)

Spanish

Save record 4

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