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BAND SILICATE [1 record]

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Record 1 2001-03-15

English

Subject field(s)
  • Mineralogy
  • Geochemistry
OBS

inosilicate (chain silicate, band silicate). ... Two important groups of rock-forming minerals are included: pyroxenes, where two of the four oxygens are shared to give a 'single chain' structure with the ratio Si : O = 1 : 3; and amphiboles, where half the SiO4 tetrahedra share two oxygens and the other half share three oxygens, to give a 'double chain' or 'band' structure and a ratio Si : O = 4 : 11.

OBS

inosilicate: A class or structural type of silicate characterized by the linkage of the SiO4 tetrahedra into linear chains by the sharing of oxygens. In a simple chain, e.g. pyroxenes, two oxygens are shared; in a double chain or band, e.g. amphiboles, half the SiO4 tetrahedra share three oxygens and the other half share two. The Si:O ratio of the former type is 1:3 and for the latter it is 4:11.

Key term(s)
  • double-chain inosilicate
  • double-chain silicate
  • band inosilicate

French

Domaine(s)
  • Minéralogie
  • Géochimie
CONT

Les inosilicates (du grec «inos», fibre) [...] peuvent être en chaîne ou en ruban. Dans le premier cas, un seul oxygène est commun à deux tétraèdres voisins. [...] Cette formule est réalisée chez les pyroxènes [...] Les inosilicates en ruban sont représentés par les amphiboles [...]

Key term(s)
  • silicate en ruban
  • inosilicate en chaîne double
  • silicate en chaîne double

Spanish

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