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ACMITE [1 record]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2012-04-13

English

Subject field(s)
  • Mineralogy
DEF

A brown or green silicate mineral of the pyroxene group, often in long, pointed prismatic crystals ...; found in igneous and metamorphic rocks.

OBS

When the composition [of acmite] varies due to ionic substitution of calcium for sodium and of magnesium and aluminum for ferric iron, the mineral is termed aegirine.

Key term(s)
  • achmite

French

Domaine(s)
  • Minéralogie
DEF

Silicate de sodium et de fer, du système cristallin monoclinique, brun ou gris, de la famille des pyroxènes, très voisin de l'aegirine, mais plus foncé.

CONT

L'acmite est un des constituants caractéristiques des roches alcalines telles les syénites néphéliniques.

CONT

L'aegyrine [...] trouvée habituellement dans les roches alcalines [...] se présente en fins cristaux verts. La variété acmite est brune.

Key term(s)
  • achmite

Spanish

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