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POLIANITE [1 record]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2016-02-05

English

Subject field(s)
  • Mineralogy
  • Iron and Manganese Mining
DEF

A steel-gray dioxide of manganese ... crystallizing in the tetragonal system.

OBS

It is distinguished from pyrolusite by its hardness and anhydrous character.

French

Domaine(s)
  • Minéralogie
  • Mines de fer et de manganèse
CONT

Les pyrolusites résultent de l'altération en polianite de l'acerdèse (ou manganite) et du grenat spessartite [...]

OBS

[La polianite] de couleur gris noir à reflet métallique, se présente quelquefois en cristaux de formes voisines de celles des autres oxydes du groupe [du rutile].

Spanish

Campo(s) temático(s)
  • Mineralogía
  • Minas de hierro y de manganeso
DEF

Bióxido de manganeso [...] que cristaliza en el sistema cuadrático [...]

OBS

[...] deriva de la acerdesa por deshidratación y constituye una mena de manganeso.

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